fix #2752 sheet_to_csv skips first blank line with blankrows: true option

sheet_to_csv skips first blank line with blankrows: true option
2022-08-26 22:10:19 +02:00
157 changed files with 8876 additions and 22767 deletions
--- a/.eslintrc
+++ b/.eslintrc
@ -11,7 +11,6 @@
 		"comma-dangle": [ 2, "never" ],
 		"curly": 0,
 		"no-bitwise": 0,
-		"no-cond-assign": 1,
 		"no-console": 0,
 		"no-control-regex": 0,
 		"no-unused-vars": 1,
--- a/.gitignore
+++ b/.gitignore
@ -14,7 +14,6 @@ tmp
 *.[pP][mM][dD]*
 *.[pP][dD][fF]
 *.[sS][lL][kK]
-*.[sS][yY][lL][kK]
 *.socialcalc
 *.[xX][lL][sSwWcCaAtTmMrR]
 *.[xX][lL][sSaAtT][xXmMbB]
@ -23,16 +22,14 @@ tmp
 *.[xX][mM][lL]
 *.[xX][lL][mM][lL]
 *.[uU][oO][sS]
-*.[wW][kKqQbB][sS1234567890]
+*.[wW][kKqQbB][S1234567890]
 *.[qQ][pP][wW]
 *.[fF][mM][3tT]
 *.[bB][iI][fF][fF][23458]
 *.[rR][tT][fF]
-*.[eE][tT]
 *.[eE][tT][hH]
 *.[nN][uU][mM][bB][eE][rR][sS]
 *.[mM][oO][dD]
-*.[dD][tT][aA]
 *.123
 *.htm
 *.html
--- a/.gitmodules
+++ b/.gitmodules
@ -1,4 +1,3 @@
 [submodule "test_files"]
 	path = test_files
 	url = https://github.com/SheetJS/test_files
-	ignore = dirty
--- a/.npmignore
+++ b/.npmignore
@ -11,7 +11,6 @@ node_modules
 *.jsx
 _book
 book.json
-v8.log
 tmp
 *.[tT][xX][tT]
 *.[cC][sS][vV]
@ -20,7 +19,6 @@ tmp
 *.[pP][mM][dD]*
 *.[pP][dD][fF]
 *.[sS][lL][kK]
-*.[sS][yY][lL][kK]
 *.socialcalc
 *.[xX][lL][sSwWcCaAtTmMrR]
 *.[xX][lL][sSaAtT][xXmMbB]
@ -34,7 +32,6 @@ tmp
 *.[fF][mM][3tT]
 *.[bB][iI][fF][fF][23458]
 *.[rR][tT][fF]
-*.[eE][tT]
 *.[eE][tT][hH]
 *.[nN][uU][mM][bB][eE][rR][sS]
 *.[mM][oO][dD]
@ -61,11 +58,11 @@ make.cmd
 xlsworker.js
 shim.js
 test.js
+hotcross.mjs
 test.mjs
 test.ts
 test.mts
 testnocp.ts
-testbun.mjs
 .jscs.json
 .gitmodules
 .travis.yml
--- a/.spelling
+++ b/.spelling
@ -54,7 +54,6 @@ Rollup
 SessionStorage
 SQLite
 SystemJS
-Vite
 VueJS
 WebKit
 WebSQL
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -4,48 +4,6 @@ This log is intended to keep track of backwards-incompatible changes, including
 but not limited to API changes and file location changes.  Minor behavioral
 changes may not be included if they are not expected to break existing code.

-## v0.20.0
-
-* Use UTC interpretation of Date objects for date cells (potentially breaking)
-* API functions support UTC and local time value interpretations
-* Export `NaN` values to `#NUM!` and infinite values to `#DIV/0!`
-
-## v0.19.3
-
-* XLSX Ensure comment address is valid (h/t @slonser)
-* Enforce Excel worksheet name restrictions
-* Fixed "Prototype Pollution" vulnerability (CVE-2023-30533)
-
-## v0.19.2
-
-* XLSX proper decoding of hyperlinks (h/t @tw-yaxu)
-* XLSX ignore unexpected attributes in rich text (h/t @colin4)
-* `sheet_to_json` type fix (h/t @chsdwn)
-
-## v0.19.1
-
-* Fixed types issue in strict mode (h/t @younes-io)
-* Numbers 12.2 parsing skip ActivityStream.iwa
-
-## v0.19.0
-
-* XLSX export hyperlinks compatible with google sheets (h/t Evan Bovie)
-* NUMBERS export multiple sheets, full worksheet range
-* formalized `dense` mode
-
-## v0.18.12
-
-* `package.json` added types in `exports` structure
-* uncapped NUMBERS single-sheet single-table export
-* DBF export records using supported codepages
-
-## v0.18.11
-
-* Base64 input ignore data URI wrapper
-* Parse ZIP files that use ZIP64 extended information field
-* More precise handling of time-only values
-* Threaded Comment fallback text for older Excel
-
 ## v0.18.10

 * `exports` field in package.json to satiate ViteJS and newer tooling
@ -63,7 +21,7 @@ changes may not be included if they are not expected to break existing code.
 ## v0.18.8

 * Plaintext parsing of dateless meridien time values (`1:23:45 PM`)
-* Legacy format (SYLK / WK# / Multiplan) minutiae
+* Legacy format (SYLK / WK# / Multiplan) minutiae 

 ## v0.18.7

--- a/23
+++ b/23
@ -107,13 +107,12 @@ dist-deps: ## Copy dependencies for distribution
 .PHONY: aux
 aux: $(AUXTARGETS)

-BYTEFILEC=dist/xlsx.{full,core,mini}.min.js xlsx.mjs
-BYTEFILER=dist/xlsx.extendscript.js
+BYTEFILEC=dist/xlsx.{full,core,mini}.min.js
+BYTEFILER=dist/xlsx.extendscript.js xlsx.mjs
 .PHONY: bytes
 bytes: ## Display minified and gzipped file sizes
 	@for i in $(BYTEFILEC); do npx printj "%-30s %7d %10d" $$i $$(wc -c < $$i) $$(gzip --best --stdout $$i | wc -c); done
 	@for i in $(BYTEFILER); do npx printj "%-30s %7d" $$i $$(wc -c < $$i); done
-	@npx printj "%-30s         %10d" "treeshake" "$$(npx -y esbuild@0.14.14 --bundle misc/import.js | wc -c)"


 .PHONY: git
@ -141,10 +140,6 @@ test mocha: test.js ## Run test suite
 #*                      To run tests for one format, make test_<fmt>
 #*                      To run the core test suite, make test_misc

-.PHONY: testdot
-testdot: test.js ## Run test suite using dot reporter
-	mocha -R dot -t 30000
-
 .PHONY: test-esm
 test-esm: test.mjs ## Run Node ESM test suite
 	npx -y mocha@9 -R spec -t 30000 $<
@ -153,27 +148,22 @@ test.ts: test.mts
 	node -pe 'var data = fs.readFileSync("'$<'", "utf8"); data.split("\n").map(function(l) { return l.replace(/^describe\((.*?)function\(\)/, "Deno.test($$1async function(t)").replace(/\b(?:it|describe)\((.*?)function\(\)/g, "await t.step($$1async function(t)").replace("assert.ok", "assert.assert"); }).join("\n")' > $@

 .PHONY: test-bun
-test-bun: testbun.mjs ## Run Bun test suite
+test-bun: hotcross.mjs ## Run Bun test suite
 	bun $<

 .PHONY: test-deno
 test-deno: test.ts ## Run Deno test suite
-	deno test --check --allow-env --allow-read --allow-write --config misc/test.deno.jsonc $<
+	deno test --allow-env --allow-read --allow-write --config misc/test.deno.jsonc $<

 .PHONY: test-denocp
 test-denocp: testnocp.ts ## Run Deno test suite (without codepage)
-	deno test --check --allow-env --allow-read --allow-write --config misc/test.deno.jsonc $<
+	deno test --allow-env --allow-read --allow-write --config misc/test.deno.jsonc $<

 TESTFMT=$(patsubst %,test_%,$(FMT))
 .PHONY: $(TESTFMT)
 $(TESTFMT): test_%:
 	FMTS=$* make test

-TESTFMT=$(patsubst %,testdot_%,$(FMT))
-.PHONY: $(TESTFMT)
-$(TESTFMT): testdot_%:
-	FMTS=$* make testdot
-
 TESTESMFMT=$(patsubst %,test-esm_%,$(FMT))
 .PHONY: $(TESTESMFMT)
 $(TESTESMFMT): test-esm_%:
@ -255,7 +245,8 @@ misc/coverage.html: $(TARGET) test.js
 coveralls: ## Coverage Test + Send to coveralls.io
 	mocha --require blanket --reporter mocha-lcov-reporter -t 30000 | node ./node_modules/coveralls/bin/coveralls.js

-MDLINT=README.md
+DEMOMDS=$(sort $(wildcard demos/*/README.md))
+MDLINT=$(DEMOMDS) README.md demos/README.md
 .PHONY: mdlint
 mdlint: $(MDLINT) ## Check markdown documents
 	./node_modules/.bin/alex $^
--- a/README.md
+++ b/README.md
@ -9,7 +9,13 @@ Edit complex templates with ease; let out your inner Picasso with styling; make
 custom sheets with images/graphs/PivotTables; evaluate formula expressions and
 port calculations to web apps; automate common spreadsheet tasks, and much more!

-[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/sheetjs?pixel)](https://git.sheetjs.com/SheetJS/sheetjs)
+[![License](https://img.shields.io/github/license/SheetJS/sheetjs)](https://github.com/SheetJS/sheetjs/blob/master/LICENSE)
+[![Build Status](https://img.shields.io/github/workflow/status/sheetjs/sheetjs/Tests:%20node.js)](https://github.com/SheetJS/sheetjs/actions)
+[![Snyk Vulnerabilities](https://img.shields.io/snyk/vulnerabilities/github/SheetJS/sheetjs)](https://snyk.io/test/github/SheetJS/sheetjs)
+[![npm Downloads](https://img.shields.io/npm/dm/xlsx.svg)](https://cdn.sheetjs.com/)
+[![GitHub Repo stars](https://img.shields.io/github/stars/SheetJS/sheetjs?style=social)](https://github.com/SheetJS/sheetjs)
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/sheetjs?pixel)](https://github.com/SheetJS/sheetjs)

 [![Build Status](https://saucelabs.com/browser-matrix/sheetjs.svg)](https://saucelabs.com/u/sheetjs)

@ -29,9 +35,9 @@ port calculations to web apps; automate common spreadsheet tasks, and much more!

 - [`test_files`](https://github.com/SheetJS/test_files): Sample spreadsheets

- [`cfb`](https://git.sheetjs.com/SheetJS/js-cfb): Container (OLE/ZIP) format library
+- [`cfb`](https://github.com/SheetJS/js-cfb): Container (OLE/ZIP) format library

- [`codepage`](https://git.sheetjs.com/SheetJS/js-codepage): Legacy text encodings
+- [`codepage`](https://github.com/SheetJS/js-codepage): Legacy text encodings

 ## License

--- a/bits/00_header.js
+++ b/bits/00_header.js
@ -1,6 +1,6 @@
 /*! xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
 /* vim: set ts=2: */
 /*exported XLSX */
-/*global global, exports, module, require:false, process:false, Buffer:false, ArrayBuffer:false, DataView:false, Deno:false, Float32Array:false */
+/*global global, exports, module, require:false, process:false, Buffer:false, ArrayBuffer:false, DataView:false, Deno:false */
 var XLSX = {};
 function make_xlsx_lib(XLSX){
--- a/bits/01_version.js
+++ b/bits/01_version.js
@ -1 +1 @@
-XLSX.version = '0.20.0';
+XLSX.version = '0.18.10';
--- a/bits/02_codepage.js
+++ b/bits/02_codepage.js
@ -41,11 +41,6 @@ function utf16leread(data/*:string*/)/*:string*/ {
 	for(var i = 0; i < (data.length>>1); ++i) o[i] = String.fromCharCode(data.charCodeAt(2*i) + (data.charCodeAt(2*i+1)<<8));
 	return o.join("");
 }
-function utf16lereadu(data/*:Uint8Array*/)/*:string*/ {
-	var o/*:Array<string>*/ = [];
-	for(var i = 0; i < (data.length>>1); ++i) o[i] = String.fromCharCode(data[2*i] + (data[2*i+1]<<8));
-	return o.join("");
-}
 function utf16beread(data/*:string*/)/*:string*/ {
 	var o/*:Array<string>*/ = [];
 	for(var i = 0; i < (data.length>>1); ++i) o[i] = String.fromCharCode(data.charCodeAt(2*i+1) + (data.charCodeAt(2*i)<<8));
--- a/bits/04_base64.js
+++ b/bits/04_base64.js
@ -45,26 +45,6 @@ function Base64_encode_pass(input) {
  }
  return o;
 }
-function Base64_encode_arr(input) {
-  var o = "";
-  var c1 = 0, c2 = 0, c3 = 0, e1 = 0, e2 = 0, e3 = 0, e4 = 0;
-  for (var i = 0; i < input.length; ) {
-    c1 = input[i++];
-    e1 = c1 >> 2;
-    c2 = input[i++];
-    e2 = (c1 & 3) << 4 | c2 >> 4;
-    c3 = input[i++];
-    e3 = (c2 & 15) << 2 | c3 >> 6;
-    e4 = c3 & 63;
-    if (isNaN(c2)) {
-      e3 = e4 = 64;
-    } else if (isNaN(c3)) {
-      e4 = 64;
-    }
-    o += Base64_map.charAt(e1) + Base64_map.charAt(e2) + Base64_map.charAt(e3) + Base64_map.charAt(e4);
-  }
-  return o;
-}
 function Base64_decode(input) {
  var o = "";
  var c1 = 0, c2 = 0, c3 = 0, e1 = 0, e2 = 0, e3 = 0, e4 = 0;
--- a/bits/05_buf.js
+++ b/bits/05_buf.js
@ -71,7 +71,7 @@ var bconcat = has_buf ? function(bufs) { return Buffer.concat(bufs.map(function(
 		for(i = 0, maxlen = 0; i < bufs.length; maxlen += len, ++i) {
 			len = bufs[i].length;
 			if(bufs[i] instanceof Uint8Array) o.set(bufs[i], maxlen);
-			else if(typeof bufs[i] == "string") o.set(new Uint8Array(s2a(bufs[i])), maxlen);
+			else if(typeof bufs[i] == "string") { throw "wtf"; }
 			else o.set(new Uint8Array(bufs[i]), maxlen);
 		}
 		return o;
--- a/bits/10_ssf.js
+++ b/bits/10_ssf.js
@ -173,20 +173,8 @@ function SSF_frac(x/*:number*/, D/*:number*/, mixed/*:?boolean*/)/*:Array<number
 	var q = Math.floor(sgn * P/Q);
 	return [q, sgn*P - q*Q, Q];
 }
-function SSF_normalize_xl_unsafe(v/*:number*/)/*:number*/ {
-	var s = v.toPrecision(16);
-	if(s.indexOf("e") > -1) {
-		var m = s.slice(0, s.indexOf("e"));
-		m = m.indexOf(".") > -1 ? m.slice(0, (m.slice(0,2) == "0." ? 17 : 16)) : (m.slice(0,15) + fill("0", m.length - 15));
-		return m + s.slice(s.indexOf("e"));
-	}
-	var n = s.indexOf(".") > -1 ? s.slice(0, (s.slice(0,2) == "0." ? 17 : 16)) : (s.slice(0,15) + fill("0", s.length - 15));
-	return Number(n);
-}
-
 function SSF_parse_date_code(v/*:number*/,opts/*:?any*/,b2/*:?boolean*/) {
 	if(v > 2958465 || v < 0) return null;
-	v = SSF_normalize_xl_unsafe(v);
 	var date = (v|0), time = Math.floor(86400 * (v - date)), dow=0;
 	var dout=[];
 	var out={D:date, T:time, u:86400*(v-date)-time,y:0,m:0,d:0,H:0,M:0,S:0,q:0};
@ -215,6 +203,15 @@ function SSF_parse_date_code(v/*:number*/,opts/*:?any*/,b2/*:?boolean*/) {
 	out.q = dow;
 	return out;
 }
+var SSFbasedate = /*#__PURE__*/new Date(1899, 11, 31, 0, 0, 0);
+var SSFdnthresh = /*#__PURE__*/SSFbasedate.getTime();
+var SSFbase1904 = /*#__PURE__*/new Date(1900, 2, 1, 0, 0, 0);
+function datenum_local(v/*:Date*/, date1904/*:?boolean*/)/*:number*/ {
+	var epoch = /*#__PURE__*/v.getTime();
+	if(date1904) epoch -= 1461*24*60*60*1000;
+	else if(v >= SSFbase1904) epoch += 24*60*60*1000;
+	return (epoch - (SSFdnthresh + (/*#__PURE__*/v.getTimezoneOffset() - /*#__PURE__*/SSFbasedate.getTimezoneOffset()) * 60000)) / (24 * 60 * 60 * 1000);
+}
 /* ECMA-376 18.8.30 numFmt*/
 /* Note: `toPrecision` uses standard form when prec > E and E >= -6 */
 /* exponent >= -9 and <= 9 */
@ -272,7 +269,7 @@ function SSF_general(v/*:any*/, opts/*:any*/) {
 		case 'undefined': return "";
 		case 'object':
 			if(v == null) return "";
-			if(v instanceof Date) return SSF_format(14, datenum(v, opts && opts.date1904), opts);
+			if(v instanceof Date) return SSF_format(14, datenum_local(v, opts && opts.date1904), opts);
 	}
 	throw new Error("unsupported value in General format: " + v);
 }
@ -340,7 +337,7 @@ function SSF_write_date(type/*:number*/, fmt/*:string*/, val, ss0/*:?number*/)/*
 		switch(fmt) {
 			case '[h]': case '[hh]': out = val.D*24+val.H; break;
 			case '[m]': case '[mm]': out = (val.D*24+val.H)*60+val.M; break;
-			case '[s]': case '[ss]': out = ((val.D*24+val.H)*60+val.M)*60+(ss0 == 0 ? Math.round(val.S+val.u) : val.S); break;
+			case '[s]': case '[ss]': out = ((val.D*24+val.H)*60+val.M)*60+Math.round(val.S+val.u); break;
 			default: throw 'bad abstime format: ' + fmt;
 		} outl = fmt.length === 3 ? 1 : 2; break;
 		case 101: /* 'e' era */
@ -788,11 +785,10 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 		switch(out[i].t) {
 			case 'h': case 'H': out[i].t = hr; lst='h'; if(bt < 1) bt = 1; break;
 			case 's':
-				if((ssm=out[i].v.match(/\.0+$/))) { ss0=Math.max(ss0,ssm[0].length-1); bt = 4;}
+				if((ssm=out[i].v.match(/\.0+$/))) ss0=Math.max(ss0,ssm[0].length-1);
 				if(bt < 3) bt = 3;
 			/* falls through */
-			case 'd': case 'y': case 'e': lst=out[i].t; break;
-			case 'M': lst=out[i].t; if(bt < 2) bt = 2; break;
+			case 'd': case 'y': case 'M': case 'e': lst=out[i].t; break;
 			case 'm': if(lst === 's') { out[i].t = 'M'; if(bt < 2) bt = 2; } break;
 			case 'X': /*if(out[i].v === "B2");*/
 				break;
@ -802,29 +798,19 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 				if(bt < 3 && out[i].v.match(/[Ss]/)) bt = 3;
 		}
 	}
-
 	/* time rounding depends on presence of minute / second / usec fields */
-	var _dt;
 	switch(bt) {
 		case 0: break;
 		case 1:
-		case 2:
-		case 3:
+			/*::if(!dt) break;*/
 			if(dt.u >= 0.5) { dt.u = 0; ++dt.S; }
 			if(dt.S >=  60) { dt.S = 0; ++dt.M; }
 			if(dt.M >=  60) { dt.M = 0; ++dt.H; }
-			if(dt.H >=  24) { dt.H = 0; ++dt.D; _dt = SSF_parse_date_code(dt.D); _dt.u = dt.u; _dt.S = dt.S; _dt.M = dt.M; _dt.H = dt.H; dt = _dt; }
 			break;
-		case 4:
-			switch(ss0) {
-				case 1: dt.u = Math.round(dt.u * 10)/10; break;
-				case 2: dt.u = Math.round(dt.u * 100)/100; break;
-				case 3: dt.u = Math.round(dt.u * 1000)/1000; break;
-			}
-			if(dt.u >=   1) { dt.u = 0; ++dt.S; }
+		case 2:
+			/*::if(!dt) break;*/
+			if(dt.u >= 0.5) { dt.u = 0; ++dt.S; }
 			if(dt.S >=  60) { dt.S = 0; ++dt.M; }
-			if(dt.M >=  60) { dt.M = 0; ++dt.H; }
-			if(dt.H >=  24) { dt.H = 0; ++dt.D; _dt = SSF_parse_date_code(dt.D); _dt.u = dt.u; _dt.S = dt.S; _dt.M = dt.M; _dt.H = dt.H; dt = _dt; }
 			break;
 	}

@ -971,7 +957,7 @@ function SSF_format(fmt/*:string|number*/,v/*:any*/,o/*:?any*/) {
 			break;
 	}
 	if(SSF_isgeneral(sfmt,0)) return SSF_general(v, o);
-	if(v instanceof Date) v = datenum(v, o.date1904);
+	if(v instanceof Date) v = datenum_local(v, o.date1904);
 	var f = choose_fmt(sfmt, v);
 	if(SSF_isgeneral(f[1])) return SSF_general(v, o);
 	if(v === true) v = "TRUE"; else if(v === false) v = "FALSE";
--- a/bits/11_ssfutils.js
+++ b/bits/11_ssfutils.js
@ -43,7 +43,6 @@ var dateNFregex = /[dD]+|[mM]+|[yYeE]+|[Hh]+|[Ss]+/g;
 function dateNF_regex(dateNF/*:string|number*/)/*:RegExp*/ {
 	var fmt = typeof dateNF == "number" ? table_fmt[dateNF] : dateNF;
 	fmt = fmt.replace(dateNFregex, "(\\d+)");
-	dateNFregex.lastIndex = 0;
 	return new RegExp("^" + fmt + "$");
 }
 function dateNF_fix(str/*:string*/, dateNF/*:string*/, match/*:Array<string>*/)/*:string*/ {
@ -56,7 +55,6 @@ function dateNF_fix(str/*:string*/, dateNF/*:string*/, match/*:Array<string>*/)/
 			case 'm': if(H >= 0) M = v; else m = v; break;
 		}
 	});
-	dateNFregex.lastIndex = 0;
 	if(S >= 0 && M == -1 && m >= 0) { M = m; m = -1; }
 	var datestr = (("" + (Y>=0?Y: new Date().getFullYear())).slice(-4) + "-" + ("00" + (m>=1?m:1)).slice(-2) + "-" + ("00" + (d>=1?d:1)).slice(-2));
 	if(datestr.length == 7) datestr = "0" + datestr;
--- a/bits/18_cfb.js
+++ b/bits/18_cfb.js
@ -73,7 +73,7 @@ function slice_by_16_tables(T) {
 		for(c = 256 + n; c < 4096; c += 256) v = table[c] = (v >>> 8) ^ T[v & 0xFF];
 	}
 	var out = [];
-	for(n = 1; n != 16; ++n) out[n - 1] = typeof Int32Array !== 'undefined' && typeof table.subarray == "function" ? table.subarray(n * 256, n * 256 + 256) : table.slice(n * 256, n * 256 + 256);
+	for(n = 1; n != 16; ++n) out[n - 1] = typeof Int32Array !== 'undefined' ? table.subarray(n * 256, n * 256 + 256) : table.slice(n * 256, n * 256 + 256);
 	return out;
 }
 var TT = slice_by_16_tables(T0);
@ -306,7 +306,7 @@ sleuth_fat(difat_start, difat_sec_cnt, sectors, ssz, fat_addrs);
 /** Chains */
 var sector_list/*:SectorList*/ = make_sector_list(sectors, dir_start, fat_addrs, ssz);

-if(dir_start < sector_list.length) sector_list[dir_start].name = "!Directory";
+sector_list[dir_start].name = "!Directory";
 if(nmfs > 0 && minifat_start !== ENDOFCHAIN) sector_list[minifat_start].name = "!MiniFAT";
 sector_list[fat_addrs[0]].name = "!FAT";
 sector_list.fat_addrs = fat_addrs;
@ -1500,9 +1500,9 @@ function write_zip(cfb/*:CFBContainer*/, options/*:CFBWriteOpts*/)/*:RawBytes*/
 		var namebuf = new_buf(fp.length);
 		for(j = 0; j < fp.length; ++j) namebuf.write_shift(1, fp.charCodeAt(j) & 0x7F);
 		namebuf = namebuf.slice(0, namebuf.l);
-		crcs[fcnt] = typeof fi.content == "string" ? CRC32.bstr(fi.content, 0) : CRC32.buf(/*::((*/fi.content/*::||[]):any)*/, 0);
+		crcs[fcnt] = CRC32.buf(/*::((*/fi.content/*::||[]):any)*/, 0);

-		var outbuf = typeof fi.content == "string" ? s2a(fi.content) : fi.content/*::||[]*/;
+		var outbuf = fi.content/*::||[]*/;
 		if(method == 8) outbuf = _deflateRawSync(outbuf);

 		/* local file header */
--- a/bits/19_fsutils.js
+++ b/bits/19_fsutils.js
@ -35,7 +35,7 @@ function write_dl(fname/*:string*/, payload/*:any*/, enc/*:?string*/) {
 			/*:: declare var chrome: any; */
 			if(typeof chrome === 'object' && typeof (chrome.downloads||{}).download == "function") {
 				if(URL.revokeObjectURL && typeof setTimeout !== 'undefined') setTimeout(function() { URL.revokeObjectURL(url); }, 60000);
-				return chrome.downloads.download({ url: url, filename: fname, saveAs: true });
+				return chrome.downloads.download({ url: url, filename: fname, saveAs: true});
 			}
 			var a = document.createElement("a");
 			if(a.download != null) {
@ -45,10 +45,6 @@ function write_dl(fname/*:string*/, payload/*:any*/, enc/*:?string*/) {
 				if(URL.revokeObjectURL && typeof setTimeout !== 'undefined') setTimeout(function() { URL.revokeObjectURL(url); }, 60000);
 				return url;
 			}
-		} else if(typeof URL !== 'undefined' && !URL.createObjectURL && typeof chrome === 'object') {
-			/* manifest v3 extensions -- no URL.createObjectURL */
-			var b64 = "data:application/octet-stream;base64," + Base64_encode_arr(new Uint8Array(blobify(data)));
-			return chrome.downloads.download({ url: b64, filename: fname, saveAs: true });
 		}
 	}
 	// $FlowIgnore
--- a/bits/20_jsutils.js
+++ b/bits/20_jsutils.js
@ -31,19 +31,22 @@ function evert_arr(obj/*:any*/)/*:EvertArrType*/ {
 	return o;
 }

-var dnthresh  = /*#__PURE__*/Date.UTC(1899, 11, 30, 0, 0, 0); // -2209161600000
-var dnthresh1 = /*#__PURE__*/Date.UTC(1899, 11, 31, 0, 0, 0); // -2209075200000
-var dnthresh2 = /*#__PURE__*/Date.UTC(1904, 0, 1, 0, 0, 0); // -2209075200000
+var basedate = /*#__PURE__*/new Date(1899, 11, 30, 0, 0, 0); // 2209161600000
 function datenum(v/*:Date*/, date1904/*:?boolean*/)/*:number*/ {
 	var epoch = /*#__PURE__*/v.getTime();
-	var res = (epoch - dnthresh) / (24 * 60 * 60 * 1000);
-	if(date1904) { res -= 1462; return res < -1402 ? res - 1 : res; }
-	return res < 60 ? res - 1 : res;
+	if(date1904) epoch -= 1462*24*60*60*1000;
+	var dnthresh = /*#__PURE__*/basedate.getTime() + (/*#__PURE__*/v.getTimezoneOffset() - /*#__PURE__*/basedate.getTimezoneOffset()) * 60000;
+	return (epoch - dnthresh) / (24 * 60 * 60 * 1000);
 }
-function numdate(v/*:number*/)/*:Date|number*/ {
-	if(v >= 60 && v < 61) return v;
+var refdate = /*#__PURE__*/new Date();
+var dnthresh = /*#__PURE__*/basedate.getTime() + (/*#__PURE__*/refdate.getTimezoneOffset() - /*#__PURE__*/basedate.getTimezoneOffset()) * 60000;
+var refoffset = /*#__PURE__*/refdate.getTimezoneOffset();
+function numdate(v/*:number*/)/*:Date*/ {
 	var out = new Date();
-	out.setTime((v>60 ? v : (v+1)) * 24 * 60 * 60 * 1000 + dnthresh);
+	out.setTime(v * 24 * 60 * 60 * 1000 + dnthresh);
+	if (out.getTimezoneOffset() !== refoffset) {
+		out.setTime(out.getTime() + (out.getTimezoneOffset() - refoffset) * 60000);
+	}
 	return out;
 }

@ -74,22 +77,28 @@ function parse_isodur(s) {
 	return sec;
 }

-/* Blame https://bugs.chromium.org/p/v8/issues/detail?id=7863 for the regexide */
-var pdre1 = /^(\d+):(\d+)(:\d+)?(\.\d+)?$/; // HH:MM[:SS[.UUU]]
-var pdre2 = /^(\d+)-(\d+)-(\d+)$/; // YYYY-mm-dd
-var pdre3 = /^(\d+)-(\d+)-(\d+)[T ](\d+):(\d+)(:\d+)?(\.\d+)?$/; // YYYY-mm-dd(T or space)HH:MM[:SS[.UUU]], sans "Z"
-/* parses a date string as a UTC date */
-function parseDate(str/*:string*/, date1904/*:boolean*/)/*:Date*/ {
-	if(str instanceof Date) return str;
-	var m = str.match(pdre1);
-	if(m) return new Date((date1904 ? dnthresh2 : dnthresh1) + ((parseInt(m[1], 10)*60 + parseInt(m[2], 10))*60 + (m[3] ? parseInt(m[3].slice(1), 10) : 0))*1000 + (m[4] ? parseInt((m[4]+"000").slice(1,4), 10) : 0));
-	m = str.match(pdre2);
-	if(m) return new Date(Date.UTC(+m[1], +m[2]-1, +m[3], 0, 0, 0, 0));
-	/* TODO: 1900-02-29T00:00:00.000 should return a flag to treat as a date code (affects xlml) */
-	m = str.match(pdre3);
-	if(m) return new Date(Date.UTC(+m[1], +m[2]-1, +m[3], +m[4], +m[5], ((m[6] && parseInt(m[6].slice(1), 10))|| 0), ((m[7] && parseInt(m[7].slice(1), 10))||0)));
+var good_pd_date_1 = /*#__PURE__*/new Date('2017-02-19T19:06:09.000Z');
+var good_pd_date = /*#__PURE__*/isNaN(/*#__PURE__*/good_pd_date_1.getFullYear()) ? /*#__PURE__*/new Date('2/19/17') : good_pd_date_1;
+var good_pd = /*#__PURE__*/good_pd_date.getFullYear() == 2017;
+/* parses a date as a local date */
+function parseDate(str/*:string|Date*/, fixdate/*:?number*/)/*:Date*/ {
 	var d = new Date(str);
-	return d;
+	if(good_pd) {
+		/*:: if(fixdate == null) fixdate = 0; */
+		if(fixdate > 0) d.setTime(d.getTime() + d.getTimezoneOffset() * 60 * 1000);
+		else if(fixdate < 0) d.setTime(d.getTime() - d.getTimezoneOffset() * 60 * 1000);
+		return d;
+	}
+	if(str instanceof Date) return str;
+	if(good_pd_date.getFullYear() == 1917 && !isNaN(d.getFullYear())) {
+		var s = d.getFullYear();
+		if(str.indexOf("" + s) > -1) return d;
+		d.setFullYear(d.getFullYear() + 100); return d;
+	}
+	var n = str.match(/\d+/g)||["2017","2","19","0","0","0"];
+	var out = new Date(+n[0], +n[1] - 1, +n[2], (+n[3]||0), (+n[4]||0), (+n[5]||0));
+	if(str.indexOf("Z") > -1) out = new Date(out.getTime() - out.getTimezoneOffset() * 60 * 1000);
+	return out;
 }

 function cc2str(arr/*:Array<number>*/, debomit)/*:string*/ {
@ -120,18 +129,8 @@ function cc2str(arr/*:Array<number>*/, debomit)/*:string*/ {
 		return new TextDecoder("latin1").decode(arr).replace(/[€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ]/g, function(c) { return rev[c] || c; });
 	} catch(e) {}

-	var o = [], i = 0;
-	// this cascade is for the browsers and runtimes of antiquity (and for modern runtimes that lack TextEncoder)
-	try {
-		for(i = 0; i < arr.length - 65536; i+=65536) o.push(String.fromCharCode.apply(0, arr.slice(i, i + 65536)));
-		o.push(String.fromCharCode.apply(0, arr.slice(i)));
-	} catch(e) { try {
-			for(; i < arr.length - 16384; i+=16384) o.push(String.fromCharCode.apply(0, arr.slice(i, i + 16384)));
-			o.push(String.fromCharCode.apply(0, arr.slice(i)));
-		} catch(e) {
-			for(; i != arr.length; ++i) o.push(String.fromCharCode(arr[i]));
-		}
-	}
+	var o = [];
+	for(var i = 0; i != arr.length; ++i) o.push(String.fromCharCode(arr[i]));
 	return o.join("");
 }

@ -161,49 +160,32 @@ function fuzzynum(s/*:string*/)/*:number*/ {

 /* NOTE: Chrome rejects bare times like 1:23 PM */
 var FDRE1 = /^(0?\d|1[0-2])(?:|:([0-5]?\d)(?:|(\.\d+)(?:|:([0-5]?\d))|:([0-5]?\d)(|\.\d+)))\s+([ap])m?$/;
-var FDRE2 = /^([01]?\d|2[0-3])(?:|:([0-5]?\d)(?:|(\.\d+)(?:|:([0-5]?\d))|:([0-5]?\d)(|\.\d+)))$/;
-var FDISO = /^(\d+)-(\d+)-(\d+)[T ](\d+):(\d+)(:\d+)(\.\d+)?[Z]?$/; // YYYY-mm-dd(T or space)HH:MM:SS[.UUU][Z]

-/* TODO: 1904 adjustment */
-var utc_append_works = new Date("6/9/69 00:00 UTC").valueOf() == -17798400000;
 function fuzzytime1(M) /*:Date*/ {
-	if(!M[2]) return new Date(Date.UTC(1899,11,31,(+M[1]%12) + (M[7] == "p" ? 12 : 0), 0, 0, 0));
-	if(M[3]) {
-			if(M[4]) return new Date(Date.UTC(1899,11,31,(+M[1]%12) + (M[7] == "p" ? 12 : 0), +M[2], +M[4], parseFloat(M[3])*1000));
-			else return new Date(Date.UTC(1899,11,31,(M[7] == "p" ? 12 : 0), +M[1], +M[2], parseFloat(M[3])*1000));
-	}
-	else if(M[5]) return new Date(Date.UTC(1899,11,31, (+M[1]%12) + (M[7] == "p" ? 12 : 0), +M[2], +M[5], M[6] ? parseFloat(M[6]) * 1000 : 0));
-	else return new Date(Date.UTC(1899,11,31,(+M[1]%12) + (M[7] == "p" ? 12 : 0), +M[2], 0, 0));
-}
-function fuzzytime2(M) /*:Date*/ {
-	if(!M[2]) return new Date(Date.UTC(1899,11,31,+M[1], 0, 0, 0));
-	if(M[3]) {
-			if(M[4]) return new Date(Date.UTC(1899,11,31,+M[1], +M[2], +M[4], parseFloat(M[3])*1000));
-			else return new Date(Date.UTC(1899,11,31,0, +M[1], +M[2], parseFloat(M[3])*1000));
-	}
-	else if(M[5]) return new Date(Date.UTC(1899,11,31, +M[1], +M[2], +M[5], M[6] ? parseFloat(M[6]) * 1000 : 0));
-	else return new Date(Date.UTC(1899,11,31,+M[1], +M[2], 0, 0));
+    /* TODO: 1904 adjustment, keep in sync with base date */
+    if(!M[2]) return new Date(1899,11,30,(+M[1]%12) + (M[7] == "p" ? 12 : 0), 0, 0, 0);
+    if(M[3]) {
+        if(M[4]) return new Date(1899,11,30,(+M[1]%12) + (M[7] == "p" ? 12 : 0), +M[2], +M[4], parseFloat(M[3])*1000);
+        else return new Date(1899,11,30,(M[7] == "p" ? 12 : 0), +M[1], +M[2], parseFloat(M[3])*1000);
+    }
+    else if(M[5]) return new Date(1899,11,30, (+M[1]%12) + (M[7] == "p" ? 12 : 0), +M[2], +M[5], M[6] ? parseFloat(M[6]) * 1000 : 0);
+    else return new Date(1899,11,30,(+M[1]%12) + (M[7] == "p" ? 12 : 0), +M[2], 0, 0);
 }
 var lower_months = ['january', 'february', 'march', 'april', 'may', 'june', 'july', 'august', 'september', 'october', 'november', 'december'];
 function fuzzydate(s/*:string*/)/*:Date*/ {
-	// See issue 2863 -- this is technically not supported in Excel but is otherwise useful
-	if(FDISO.test(s)) return s.indexOf("Z") == -1 ? local_to_utc(new Date(s)) : new Date(s);
 	var lower = s.toLowerCase();
 	var lnos = lower.replace(/\s+/g, " ").trim();
 	var M = lnos.match(FDRE1);
 	if(M) return fuzzytime1(M);
-	M = lnos.match(FDRE2);
-	if(M) return fuzzytime2(M);
-	M = lnos.match(pdre3);
-	if(M) return new Date(Date.UTC(+M[1], +M[2]-1, +M[3], +M[4], +M[5], ((M[6] && parseInt(M[6].slice(1), 10))|| 0), ((M[7] && parseInt(M[7].slice(1), 10))||0)));
-	var o = new Date(utc_append_works && s.indexOf("UTC") == -1 ? s + " UTC": s), n = new Date(NaN);
+
+	var o = new Date(s), n = new Date(NaN);
 	var y = o.getYear(), m = o.getMonth(), d = o.getDate();
 	if(isNaN(d)) return n;
 	if(lower.match(/jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec/)) {
 		lower = lower.replace(/[^a-z]/g,"").replace(/([^a-z]|^)[ap]m?([^a-z]|$)/,"");
 		if(lower.length > 3 && lower_months.indexOf(lower) == -1) return n;
 	} else if(lower.replace(/[ap]m?/, "").match(/[a-z]/)) return n;
-	if(y < 0 || y > 8099 || s.match(/[^-0-9:,\/\\\ ]/)) return n;
+	if(y < 0 || y > 8099 || s.match(/[^-0-9:,\/\\]/)) return n;
 	return o;
 }

@ -216,10 +198,3 @@ var split_regex = /*#__PURE__*/(function() {
 		return o;
 	};
 })();
-
-function utc_to_local(utc) {
-	return new Date(utc.getUTCFullYear(), utc.getUTCMonth(), utc.getUTCDate(), utc.getUTCHours(), utc.getUTCMinutes(), utc.getUTCSeconds(), utc.getUTCMilliseconds());
-}
-function local_to_utc(local) {
-	return new Date(Date.UTC(local.getFullYear(), local.getMonth(), local.getDate(), local.getHours(), local.getMinutes(), local.getSeconds(), local.getMilliseconds()));
-}
--- a/bits/23_binutils.js
+++ b/bits/23_binutils.js
@ -181,29 +181,21 @@ function WriteShift(t/*:number*/, val/*:string|number*/, f/*:?string*/)/*:any*/
 		/*:: if(typeof val !== 'string') throw new Error("unreachable"); */
 		for(i = 0; i != val.length; ++i) __writeUInt16LE(this, val.charCodeAt(i), this.l + 2 * i);
 		size = 2 * val.length;
-	} else if(f === 'sbcs' || f == 'cpstr') {
+	} else if(f === 'sbcs') {
 		if(typeof $cptable !== 'undefined' && current_ansi == 874) {
 			/* TODO: use tables directly, don't encode */
 			/*:: if(typeof val !== "string") throw new Error("unreachable"); */
 			for(i = 0; i != val.length; ++i) {
-				var cpp = $cptable.utils.encode(current_ansi, val.charAt(i));
-				this[this.l + i] = cpp[0];
+				var cppayload = $cptable.utils.encode(current_ansi, val.charAt(i));
+				this[this.l + i] = cppayload[0];
 			}
-			size = val.length;
-		} else if(typeof $cptable !== 'undefined' && f == 'cpstr') {
-			cpp = $cptable.utils.encode(current_codepage, val);
-			/* replace null bytes with _ when relevant */
-      if(cpp.length == val.length) for(i = 0; i < val.length; ++i) if(cpp[i] == 0 && val.charCodeAt(i) != 0) cpp[i] = 0x5F;
-      if(cpp.length == 2 * val.length) for(i = 0; i < val.length; ++i) if(cpp[2*i] == 0 && cpp[2*i+1] == 0 && val.charCodeAt(i) != 0) cpp[2*i] = 0x5F;
-			for(i = 0; i < cpp.length; ++i) this[this.l + i] = cpp[i];
-			size = cpp.length;
 		} else {
 			/*:: if(typeof val !== 'string') throw new Error("unreachable"); */
 			val = val.replace(/[^\x00-\x7F]/g, "_");
 			/*:: if(typeof val !== 'string') throw new Error("unreachable"); */
 			for(i = 0; i != val.length; ++i) this[this.l + i] = (val.charCodeAt(i) & 0xFF);
-			size = val.length;
 		}
+		size = val.length;
 	} else if(f === 'hex') {
 		for(; i < t; ++i) {
 			/*:: if(typeof val !== "string") throw new Error("unreachable"); */
--- a/bits/27_csfutils.js
+++ b/bits/27_csfutils.js
@ -9,6 +9,7 @@ function fix_col(cstr/*:string*/)/*:string*/ { return cstr.replace(/^([A-Z])/,"$
 function unfix_col(cstr/*:string*/)/*:string*/ { return cstr.replace(/^\$([A-Z])/,"$1"); }

 function split_cell(cstr/*:string*/)/*:Array<string>*/ { return cstr.replace(/(\$?[A-Z]*)(\$?\d*)/,"$1,$2").split(","); }
+//function decode_cell(cstr/*:string*/)/*:CellAddress*/ { var splt = split_cell(cstr); return { c:decode_col(splt[0]), r:decode_row(splt[1]) }; }
 function decode_cell(cstr/*:string*/)/*:CellAddress*/ {
 	var R = 0, C = 0;
 	for(var i = 0; i < cstr.length; ++i) {
@ -18,6 +19,7 @@ function decode_cell(cstr/*:string*/)/*:CellAddress*/ {
 	}
 	return { c: C - 1, r:R - 1 };
 }
+//function encode_cell(cell/*:CellAddress*/)/*:string*/ { return encode_col(cell.c) + encode_row(cell.r); }
 function encode_cell(cell/*:CellAddress*/)/*:string*/ {
 	var col = cell.c + 1;
 	var s="";
@ -108,19 +110,11 @@ function sheet_to_workbook(sheet/*:Worksheet*/, opts)/*:Workbook*/ {
 	return { SheetNames: [n], Sheets: sheets };
 }

-function sheet_new(opts) {
-	var out = {};
-	var o = opts || {};
-	if(o.dense) out["!data"] = [];
-	return out;
-}
-
 function sheet_add_aoa(_ws/*:?Worksheet*/, data/*:AOA*/, opts/*:?any*/)/*:Worksheet*/ {
 	var o = opts || {};
-	var dense = _ws ? (_ws["!data"] != null) : o.dense;
+	var dense = _ws ? Array.isArray(_ws) : o.dense;
 	if(DENSE != null && dense == null) dense = DENSE;
-	var ws/*:Worksheet*/ = _ws || ({}/*:any*/);
-	if(dense && !ws["!data"]) ws["!data"] = [];
+	var ws/*:Worksheet*/ = _ws || (dense ? ([]/*:any*/) : ({}/*:any*/));
 	var _R = 0, _C = 0;
 	if(ws && o.origin != null) {
 		if(typeof o.origin == 'number') _R = o.origin;
@ -139,19 +133,13 @@ function sheet_add_aoa(_ws/*:?Worksheet*/, data/*:AOA*/, opts/*:?any*/)/*:Worksh
 		range.e.r = Math.max(range.e.r, _range.e.r);
 		if(_R == -1) range.e.r = _R = _range.e.r + 1;
 	}
-	var row = [];
 	for(var R = 0; R != data.length; ++R) {
 		if(!data[R]) continue;
 		if(!Array.isArray(data[R])) throw new Error("aoa_to_sheet expects an array of arrays");
-		var __R = _R + R, __Rstr = "" + (__R + 1);
-		if(dense) {
-			if(!ws["!data"][__R]) ws["!data"][__R] = [];
-			row = ws["!data"][__R];
-		}
 		for(var C = 0; C != data[R].length; ++C) {
 			if(typeof data[R][C] === 'undefined') continue;
 			var cell/*:Cell*/ = ({v: data[R][C] }/*:any*/);
-			var __C = _C + C;
+			var __R = _R + R, __C = _C + C;
 			if(range.s.r > __R) range.s.r = __R;
 			if(range.s.c > __C) range.s.c = __C;
 			if(range.e.r < __R) range.e.r = __R;
@ -169,23 +157,27 @@ function sheet_add_aoa(_ws/*:?Worksheet*/, data/*:AOA*/, opts/*:?any*/)/*:Worksh
 				else if(typeof cell.v === 'boolean') cell.t = 'b';
 				else if(cell.v instanceof Date) {
 					cell.z = o.dateNF || table_fmt[14];
-					if(!o.UTC) cell.v = local_to_utc(cell.v);
 					if(o.cellDates) { cell.t = 'd'; cell.w = SSF_format(cell.z, datenum(cell.v, o.date1904)); }
 					else { cell.t = 'n'; cell.v = datenum(cell.v, o.date1904); cell.w = SSF_format(cell.z, cell.v); }
 				}
 				else cell.t = 's';
 			}
 			if(dense) {
-				if(row[__C] && row[__C].z) cell.z = row[__C].z;
-				row[__C] = cell;
+				if(!ws[__R]) ws[__R] = [];
+				if(ws[__R][__C] && ws[__R][__C].z) cell.z = ws[__R][__C].z;
+				ws[__R][__C] = cell;
 			} else {
-				var cell_ref = encode_col(__C) + __Rstr/*:any*/;
+				var cell_ref = encode_cell(({c:__C,r:__R}/*:any*/));
 				if(ws[cell_ref] && ws[cell_ref].z) cell.z = ws[cell_ref].z;
 				ws[cell_ref] = cell;
 			}
 		}
 	}
-	if(range.s.c < 10000000) ws['!ref'] = encode_range(range);
+	if (range.s.c < 10000000) {
+		if (range.s.c > _C) range.s.c = _C;
+		if (range.s.r > _R) range.s.r = _R;
+		ws['!ref'] = encode_range(range);
+	}
 	return ws;
 }
 function aoa_to_sheet(data/*:AOA*/, opts/*:?any*/)/*:Worksheet*/ { return sheet_add_aoa(null, data, opts); }
--- a/bits/31_rels.js
+++ b/bits/31_rels.js
@ -52,7 +52,7 @@ function parse_rels(data/*:?string*/, currentFilePath/*:string*/) {
 		var y = parsexmltag(x);
 		/* 9.3.2.2 OPC_Relationships */
 		if (y[0] === '<Relationship') {
-			var rel = {}; rel.Type = y.Type; rel.Target = unescapexml(y.Target); rel.Id = y.Id; if(y.TargetMode) rel.TargetMode = y.TargetMode;
+			var rel = {}; rel.Type = y.Type; rel.Target = y.Target; rel.Id = y.Id; if(y.TargetMode) rel.TargetMode = y.TargetMode;
 			var canonictarget = y.TargetMode === 'External' ? y.Target : resolve_path(y.Target, currentFilePath);
 			rels[canonictarget] = rel;
 			hash[y.Id] = rel;
--- a/bits/32_odmanrdf.js
+++ b/bits/32_odmanrdf.js
@ -1,61 +1,62 @@
+/* Open Document Format for Office Applications (OpenDocument) Version 1.2 */
+/* Part 3 Section 4 Manifest File */
 var CT_ODS = "application/vnd.oasis.opendocument.spreadsheet";
 function parse_manifest(d, opts) {
-  var str = xlml_normalize(d);
-  var Rn;
-  var FEtag;
-  while (Rn = xlmlregex.exec(str))
-    switch (Rn[3]) {
-      case "manifest":
-        break;
-      case "file-entry":
-        FEtag = parsexmltag(Rn[0], false);
-        if (FEtag.path == "/" && FEtag.type !== CT_ODS)
-          throw new Error("This OpenDocument is not a spreadsheet");
-        break;
-      case "encryption-data":
-      case "algorithm":
-      case "start-key-generation":
-      case "key-derivation":
-        throw new Error("Unsupported ODS Encryption");
-      default:
-        if (opts && opts.WTF)
-          throw Rn;
-    }
+	var str = xlml_normalize(d);
+	var Rn;
+	var FEtag;
+	while((Rn = xlmlregex.exec(str))) switch(Rn[3]) {
+		case 'manifest': break; // 4.2 <manifest:manifest>
+		case 'file-entry': // 4.3 <manifest:file-entry>
+			FEtag = parsexmltag(Rn[0], false);
+			if(FEtag.path == '/' && FEtag.type !== CT_ODS) throw new Error("This OpenDocument is not a spreadsheet");
+			break;
+		case 'encryption-data': // 4.4 <manifest:encryption-data>
+		case 'algorithm': // 4.5 <manifest:algorithm>
+		case 'start-key-generation': // 4.6 <manifest:start-key-generation>
+		case 'key-derivation': // 4.7 <manifest:key-derivation>
+			throw new Error("Unsupported ODS Encryption");
+		default: if(opts && opts.WTF) throw Rn;
+	}
 }
-function write_manifest(manifest) {
-  var o = [XML_HEADER];
-  o.push('<manifest:manifest xmlns:manifest="urn:oasis:names:tc:opendocument:xmlns:manifest:1.0" manifest:version="1.2">\n');
-  o.push('  <manifest:file-entry manifest:full-path="/" manifest:version="1.2" manifest:media-type="application/vnd.oasis.opendocument.spreadsheet"/>\n');
-  for (var i = 0; i < manifest.length; ++i)
-    o.push('  <manifest:file-entry manifest:full-path="' + manifest[i][0] + '" manifest:media-type="' + manifest[i][1] + '"/>\n');
-  o.push("</manifest:manifest>");
-  return o.join("");
+
+function write_manifest(manifest/*:Array<Array<string> >*/)/*:string*/ {
+	var o = [XML_HEADER];
+	o.push('<manifest:manifest xmlns:manifest="urn:oasis:names:tc:opendocument:xmlns:manifest:1.0" manifest:version="1.2">\n');
+	o.push('  <manifest:file-entry manifest:full-path="/" manifest:version="1.2" manifest:media-type="application/vnd.oasis.opendocument.spreadsheet"/>\n');
+	for(var i = 0; i < manifest.length; ++i) o.push('  <manifest:file-entry manifest:full-path="' + manifest[i][0] + '" manifest:media-type="' + manifest[i][1] + '"/>\n');
+	o.push('</manifest:manifest>');
+	return o.join("");
 }
-function write_rdf_type(file, res, tag) {
-  return [
-    '  <rdf:Description rdf:about="' + file + '">\n',
-    '    <rdf:type rdf:resource="http://docs.oasis-open.org/ns/office/1.2/meta/' + (tag || "odf") + "#" + res + '"/>\n',
-    "  </rdf:Description>\n"
-  ].join("");
+
+/* Part 3 Section 6 Metadata Manifest File */
+function write_rdf_type(file/*:string*/, res/*:string*/, tag/*:?string*/) {
+	return [
+		'  <rdf:Description rdf:about="' + file + '">\n',
+		'    <rdf:type rdf:resource="http://docs.oasis-open.org/ns/office/1.2/meta/' + (tag || "odf") + '#' + res + '"/>\n',
+		'  </rdf:Description>\n'
+	].join("");
 }
-function write_rdf_has(base, file) {
-  return [
-    '  <rdf:Description rdf:about="' + base + '">\n',
-    '    <ns0:hasPart xmlns:ns0="http://docs.oasis-open.org/ns/office/1.2/meta/pkg#" rdf:resource="' + file + '"/>\n',
-    "  </rdf:Description>\n"
-  ].join("");
+function write_rdf_has(base/*:string*/, file/*:string*/) {
+	return [
+		'  <rdf:Description rdf:about="' + base + '">\n',
+		'    <ns0:hasPart xmlns:ns0="http://docs.oasis-open.org/ns/office/1.2/meta/pkg#" rdf:resource="' + file + '"/>\n',
+		'  </rdf:Description>\n'
+	].join("");
 }
 function write_rdf(rdf) {
-  var o = [XML_HEADER];
-  o.push('<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">\n');
-  for (var i = 0; i != rdf.length; ++i) {
-    o.push(write_rdf_type(rdf[i][0], rdf[i][1]));
-    o.push(write_rdf_has("", rdf[i][0]));
-  }
-  o.push(write_rdf_type("", "Document", "pkg"));
-  o.push("</rdf:RDF>");
-  return o.join("");
+	var o = [XML_HEADER];
+	o.push('<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">\n');
+	for(var i = 0; i != rdf.length; ++i) {
+		o.push(write_rdf_type(rdf[i][0], rdf[i][1]));
+		o.push(write_rdf_has("",rdf[i][0]));
+	}
+	o.push(write_rdf_type("","Document", "pkg"));
+	o.push('</rdf:RDF>');
+	return o.join("");
 }
-function write_meta_ods(wb, opts) {
-  return '<office:document-meta xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:meta="urn:oasis:names:tc:opendocument:xmlns:meta:1.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xlink="http://www.w3.org/1999/xlink" office:version="1.2"><office:meta><meta:generator>SheetJS ' + XLSX.version + "</meta:generator></office:meta></office:document-meta>";
+/* TODO: pull properties */
+function write_meta_ods(/*:: wb: Workbook, opts: any*/)/*:string*/ {
+	return '<office:document-meta xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:meta="urn:oasis:names:tc:opendocument:xmlns:meta:1.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xlink="http://www.w3.org/1999/xlink" office:version="1.2"><office:meta><meta:generator>Sheet' + 'JS ' + XLSX.version + '</meta:generator></office:meta></office:document-meta>';
 }
+
--- a/bits/39_xlsbiff.js
+++ b/bits/39_xlsbiff.js
@ -1,20 +1,9 @@
 /* [MS-XLS] 2.5.19 */
-function parse_XLSCell(blob, length, opts)/*:Cell*/ {
+function parse_XLSCell(blob/*::, length*/)/*:Cell*/ {
 	var rw = blob.read_shift(2); // 0-indexed
 	var col = blob.read_shift(2);
-	var ret = ({r:rw, c:col, ixfe:0}/*:any*/);
-	if(opts && opts.biff == 2 || length == 7) {
-		/* TODO: pass back flags */
-		var flags = blob.read_shift(1);
-		ret.ixfe = flags & 0x3F;
-		blob.l += 2;
-		/*
-		var ifntifmt = blob.read_shift(1);
-		var ifmt = ifntifmt & 0x3f, ifnt = ifntifmt >> 6;
-		var flags3 = blob.read_shift(1);
-		*/
-	} else ret.ixfe = blob.read_shift(2);
-	return ret;
+	var ixfe = blob.read_shift(2);
+	return ({r:rw, c:col, ixfe:ixfe}/*:any*/);
 }
 function write_XLSCell(R/*:number*/, C/*:number*/, ixfe/*:?number*/, o) {
 	if(!o) o = new_buf(6);
@ -149,7 +138,7 @@ function parse_FtArray(blob, length/*::, ot*/) {
 		var ft = blob.read_shift(2);
 		blob.l-=2;
 		try {
-			fts[ft] = FtTab[ft](blob, tgt - blob.l);
+			fts.push(FtTab[ft](blob, tgt - blob.l));
 		} catch(e) { blob.l = tgt; return fts; }
 	}
 	if(blob.l != tgt) blob.l = tgt; //throw new Error("bad Object Ft-sequence");
@ -239,12 +228,6 @@ function parse_WsBool(blob, length, opts) {

 /* [MS-XLS] 2.4.28 */
 function parse_BoundSheet8(blob, length, opts) {
-	var name = "";
-	if(opts.biff == 4) {
-		name = parse_ShortXLUnicodeString(blob, 0, opts);
-		if(name.length === 0) name = "Sheet1";
-		return { name:name };
-	}
 	var pos = blob.read_shift(4);
 	var hidden = blob.read_shift(1) & 0x03;
 	var dt = blob.read_shift(1);
@ -254,7 +237,7 @@ function parse_BoundSheet8(blob, length, opts) {
 		case 2: dt = 'Chartsheet'; break;
 		case 6: dt = 'VBAModule'; break;
 	}
-	name = parse_ShortXLUnicodeString(blob, 0, opts);
+	var name = parse_ShortXLUnicodeString(blob, 0, opts);
 	if(name.length === 0) name = "Sheet1";
 	return { pos:pos, hs:hidden, dt:dt, name:name };
 }
@ -425,8 +408,8 @@ function write_Font(data, opts) {
 }

 /* [MS-XLS] 2.4.149 */
-function parse_LabelSst(blob, length, opts) {
-	var cell = parse_XLSCell(blob, length, opts);
+function parse_LabelSst(blob) {
+	var cell = parse_XLSCell(blob);
 	cell.isst = blob.read_shift(4);
 	return cell;
 }
@ -441,7 +424,8 @@ function write_LabelSst(R/*:number*/, C/*:number*/, v/*:number*/, os/*:number*/
 function parse_Label(blob, length, opts) {
 	if(opts.biffguess && opts.biff == 2) opts.biff = 5;
 	var target = blob.l + length;
-	var cell = parse_XLSCell(blob, length, opts);
+	var cell = parse_XLSCell(blob, 6);
+	if(opts.biff == 2) blob.l++;
 	var str = parse_XLUnicodeString(blob, target - blob.l, opts);
 	cell.val = str;
 	return cell;
@ -475,19 +459,6 @@ function write_Format(i/*:number*/, f/*:string*/, opts, o) {
 	return out;
 }
 var parse_BIFF2Format = parse_XLUnicodeString2;
-function write_BIFF2Format(f/*:string*/) {
-	var o = new_buf(1 + f.length);
-	o.write_shift(1, f.length);
-	o.write_shift(f.length, f, "sbcs");
-	return o;
-}
-function write_BIFF4Format(f/*:string*/) {
-	var o = new_buf(3 + f.length);
-	o.l += 2;
-	o.write_shift(1, f.length);
-	o.write_shift(f.length, f, "sbcs");
-	return o;
-}

 /* [MS-XLS] 2.4.90 */
 function parse_Dimensions(blob, length, opts) {
@ -611,44 +582,6 @@ function write_XF(data, ixfeP, opts, o) {
 	o.write_shift(2, 0);
 	return o;
 }
-function parse_BIFF2XF(blob/*::, length, opts*/) {
-	var o = {};
-	o.ifnt = blob.read_shift(1); blob.l++; o.flags = blob.read_shift(1);
-	o.numFmtId = o.flags & 0x3F; o.flags>>=6;
-	o.fStyle = 0;
-	o.data = {}; // TODO
-	return o;
-}
-function write_BIFF2XF(xf) {
-	var o = new_buf(4);
-	o.l+=2;
-	o.write_shift(1, xf.numFmtId);
-	o.l++;
-	return o;
-}
-function write_BIFF3XF(xf) {
-	var o = new_buf(12);
-	o.l++;
-	o.write_shift(1, xf.numFmtId);
-	o.l += 10;
-	return o;
-}
-/* TODO: check other fields */
-var write_BIFF4XF = write_BIFF3XF;
-function parse_BIFF3XF(blob/*::, length, opts*/) {
-	var o = {};
-	o.ifnt = blob.read_shift(1); o.numFmtId = blob.read_shift(1); o.flags = blob.read_shift(2);
-	o.fStyle = (o.flags >> 2) & 0x01;
-	o.data = {}; // TODO
-	return o;
-}
-function parse_BIFF4XF(blob/*::, length, opts*/) {
-	var o = {};
-	o.ifnt = blob.read_shift(1); o.numFmtId = blob.read_shift(1); o.flags = blob.read_shift(2);
-	o.fStyle = (o.flags >> 2) & 0x01;
-	o.data = {}; // TODO
-	return o;
-}

 /* [MS-XLS] 2.4.134 */
 function parse_Guts(blob) {
@ -669,7 +602,8 @@ function write_Guts(guts/*:Array<number>*/) {

 /* [MS-XLS] 2.4.24 */
 function parse_BoolErr(blob, length, opts) {
-	var cell = parse_XLSCell(blob, 6, opts);
+	var cell = parse_XLSCell(blob, 6);
+	if(opts.biff == 2 || length == 9) ++blob.l;
 	var val = parse_Bes(blob, 2);
 	cell.val = val;
 	cell.t = (val === true || val === false) ? 'b' : 'e';
@ -685,7 +619,7 @@ function write_BoolErr(R/*:number*/, C/*:number*/, v, os/*:number*/, opts, t/*:s
 /* [MS-XLS] 2.4.180 Number */
 function parse_Number(blob, length, opts) {
 	if(opts.biffguess && opts.biff == 2) opts.biff = 5;
-	var cell = parse_XLSCell(blob, 6, opts);
+	var cell = parse_XLSCell(blob, 6);
 	var xnum = parse_Xnum(blob, 8);
 	cell.val = xnum;
 	return cell;
@ -762,11 +696,9 @@ function parse_Lbl(blob, length, opts) {
 	};
 }

-/* [MS-XLS] 2.4.106 TODO: legacy record filename encoding */
+/* [MS-XLS] 2.4.106 TODO: verify filename encoding */
 function parse_ExternSheet(blob, length, opts) {
 	if(opts.biff < 8) return parse_BIFF5ExternSheet(blob, length, opts);
-	/* see issue 2907 */
-	if(!(opts.biff > 8) && (length == blob[blob.l] + (blob[blob.l+1] == 0x03 ? 1 : 0) + 1)) return parse_BIFF5ExternSheet(blob, length, opts);
 	var o = [], target = blob.l + length, len = blob.read_shift(opts.biff > 8 ? 4 : 2);
 	while(len-- !== 0) o.push(parse_XTI(blob, opts.biff > 8 ? 12 : 6, opts));
 		// [iSupBook, itabFirst, itabLast];
@ -818,34 +750,21 @@ function parse_MTRSettings(blob) {
 	return [fMTREnabled, fUserSetThreadCount, cUserThreadCount];
 }

-/* [MS-XLS] 2.5.186 */
+/* [MS-XLS] 2.5.186 TODO: BIFF5 */
 function parse_NoteSh(blob, length, opts) {
+	if(opts.biff < 8) return;
 	var row = blob.read_shift(2), col = blob.read_shift(2);
 	var flags = blob.read_shift(2), idObj = blob.read_shift(2);
 	var stAuthor = parse_XLUnicodeString2(blob, 0, opts);
+	if(opts.biff < 8) blob.read_shift(1);
 	return [{r:row,c:col}, stAuthor, idObj, flags];
 }

 /* [MS-XLS] 2.4.179 */
 function parse_Note(blob, length, opts) {
-	if(opts && (opts.biff < 8)) {
-		var row = blob.read_shift(2), col = blob.read_shift(2);
-		if(row == 0xFFFF || row == -1) return; // TODO: test continuation
-		var cch = blob.read_shift(2);
-		var cmnt = blob.read_shift(Math.min(cch,2048), 'cpstr');
-		return [{r:row, c:col}, cmnt];
-	}
 	/* TODO: Support revisions */
 	return parse_NoteSh(blob, length, opts);
 }
-function write_NOTE_BIFF2(text/*:string*/, R/*:number*/, C/*:number*/, len/*?:number*/) {
-	var o = new_buf(6 + (len || text.length));
-	o.write_shift(2, R);
-	o.write_shift(2, C);
-	o.write_shift(2, len || text.length);
-	o.write_shift(text.length, text, "sbcs");
-	return o;
-}

 /* [MS-XLS] 2.4.168 */
 function parse_MergeCells(blob, length)/*:Array<Range>*/ {
@ -1095,50 +1014,43 @@ function parse_ImData(blob) {
 	return o;
 }

-function write_BIFF2Cell(out, r/*:number*/, c/*:number*/, ixfe/*:number*/, ifmt/*:number*/) {
-	if(!out) out = new_buf(7);
-	out.write_shift(2, r);
-	out.write_shift(2, c);
-	out.write_shift(1, ixfe||0/* & 0x3F */);
-	out.write_shift(1, ifmt||0/* & 0x3F */);
-	out.write_shift(1, 0);
-	return out;
-}
-
 /* BIFF2_??? where ??? is the name from [XLS] */
 function parse_BIFF2STR(blob, length, opts) {
 	if(opts.biffguess && opts.biff == 5) opts.biff = 2;
-	var cell = parse_XLSCell(blob, 7, opts);
+	var cell = parse_XLSCell(blob, 6);
+	++blob.l;
 	var str = parse_XLUnicodeString2(blob, length-7, opts);
 	cell.t = 'str';
 	cell.val = str;
 	return cell;
 }

-function parse_BIFF2NUM(blob, length, opts) {
-	var cell = parse_XLSCell(blob, 7, opts);
+function parse_BIFF2NUM(blob/*::, length*/) {
+	var cell = parse_XLSCell(blob, 6);
+	++blob.l;
 	var num = parse_Xnum(blob, 8);
 	cell.t = 'n';
 	cell.val = num;
 	return cell;
 }
-function write_BIFF2NUM(r/*:number*/, c/*:number*/, val/*:number*/, ixfe, ifmt) {
+function write_BIFF2NUM(r/*:number*/, c/*:number*/, val/*:number*/) {
 	var out = new_buf(15);
-	write_BIFF2Cell(out, r, c, ixfe||0, ifmt||0);
+	write_BIFF2Cell(out, r, c);
 	out.write_shift(8, val, 'f');
 	return out;
 }

-function parse_BIFF2INT(blob, length, opts) {
-	var cell = parse_XLSCell(blob, 7, opts);
+function parse_BIFF2INT(blob) {
+	var cell = parse_XLSCell(blob, 6);
+	++blob.l;
 	var num = blob.read_shift(2);
 	cell.t = 'n';
 	cell.val = num;
 	return cell;
 }
-function write_BIFF2INT(r/*:number*/, c/*:number*/, val/*:number*/, ixfe/*:number*/, ifmt/*:number*/) {
+function write_BIFF2INT(r/*:number*/, c/*:number*/, val/*:number*/) {
 	var out = new_buf(9);
-	write_BIFF2Cell(out, r, c, ixfe||0, ifmt||0);
+	write_BIFF2Cell(out, r, c);
 	out.write_shift(2, val);
 	return out;
 }
@ -1149,16 +1061,6 @@ function parse_BIFF2STRING(blob) {
 	return blob.read_shift(cch, 'sbcs-cont');
 }

-function parse_BIFF2BOOLERR(blob, length, opts) {
-	var bestart = blob.l + 7;
-	var cell = parse_XLSCell(blob, 6, opts);
-	blob.l = bestart;
-	var val = parse_Bes(blob, 2);
-	cell.val = val;
-	cell.t = (val === true || val === false) ? 'b' : 'e';
-	return cell;
-}
-
 /* TODO: convert to BIFF8 font struct */
 function parse_BIFF2FONTXTRA(blob, length) {
 	blob.l += 6; // unknown
@ -1172,7 +1074,7 @@ function parse_BIFF2FONTXTRA(blob, length) {
 /* TODO: parse rich text runs */
 function parse_RString(blob, length, opts) {
 	var end = blob.l + length;
-	var cell = parse_XLSCell(blob, 6, opts);
+	var cell = parse_XLSCell(blob, 6);
 	var cch = blob.read_shift(2);
 	var str = parse_XLUnicodeStringNoCch(blob, cch, opts);
 	blob.l = end;
@ -1180,10 +1082,3 @@ function parse_RString(blob, length, opts) {
 	cell.val = str;
 	return cell;
 }
-
-function parse_BIFF4SheetInfo(blob/*::, length, opts*/) {
-	var flags = blob.read_shift(4);
-	var cch = blob.read_shift(1), name = blob.read_shift(cch, "sbcs");
-	if(name.length === 0) name = "Sheet1";
-	return { flags: flags, name:name };
-}
--- a/bits/40_harb.js
+++ b/bits/40_harb.js
@ -1,3 +1,4 @@
+/* from js-harb (C) 2014-present  SheetJS */
 var DBF_SUPPORTED_VERSIONS = [0x02, 0x03, 0x30, 0x31, 0x83, 0x8B, 0x8C, 0xF5];
 var DBF = /*#__PURE__*/(function() {
 var dbf_codepage_map = {
@ -179,10 +180,7 @@ function dbf_to_aoa(buf, opts)/*:AOA*/ {
 					if(s.trim().length) out[R][C] = s.replace(/\s+$/,"");
 					break;
 				case 'D':
-					if(s.length === 8) {
-						out[R][C] = new Date(Date.UTC(+s.slice(0,4), +s.slice(4,6)-1, +s.slice(6,8), 0, 0, 0, 0));
-						if(!(opts && opts.UTC)) { out[R][C] = utc_to_local(out[R][C]); }
-					}
+					if(s.length === 8) out[R][C] = new Date(+s.slice(0,4), +s.slice(4,6)-1, +s.slice(6,8));
 					else out[R][C] = s;
 					break;
 				case 'F': out[R][C] = parseFloat(s.trim()); break;
@ -190,7 +188,7 @@ function dbf_to_aoa(buf, opts)/*:AOA*/ {
 				case 'L': switch(s.trim().toUpperCase()) {
 					case 'Y': case 'T': out[R][C] = true; break;
 					case 'N': case 'F': out[R][C] = false; break;
-					case '': case '\x00': case '?': break;
+					case '': case '?': break;
 					default: throw new Error("DBF Unrecognized L:|" + s + "|");
 					} break;
 				case 'M': /* TODO: handle memo files */
@ -205,12 +203,7 @@ function dbf_to_aoa(buf, opts)/*:AOA*/ {
 					// NOTE: dBASE specs appear to be incorrect
 					out[R][C] = new Date(dd.read_shift(-8, 'f') - 0x388317533400);
 					break;
-				case 'T': {
-					var hi = dd.read_shift(4), lo = dd.read_shift(4);
-					if(hi == 0 && lo == 0) break;
-					out[R][C] = new Date((hi - 0x253D8C) * 0x5265C00 + lo);
-					if(!(opts && opts.UTC)) out[R][C] = utc_to_local(out[R][C]);
-				} break;
+				case 'T': out[R][C] = new Date((dd.read_shift(4) - 0x253D8C) * 0x5265C00 + dd.read_shift(4)); break;
 				case 'Y': out[R][C] = dd.read_shift(4,'i')/1e4 + (dd.read_shift(4, 'i')/1e4)*Math.pow(2,32); break;
 				case 'O': out[R][C] = -dd.read_shift(-8, 'f'); break;
 				case 'B': if(vfp && fields[C].len == 8) { out[R][C] = dd.read_shift(8,'f'); break; }
@ -246,15 +239,14 @@ function dbf_to_workbook(buf, opts)/*:Workbook*/ {
 		var o = sheet_to_workbook(dbf_to_sheet(buf, opts), opts);
 		o.bookType = "dbf";
 		return o;
-	} catch(e) { if(opts && opts.WTF) throw e; }
+	}
+	catch(e) { if(opts && opts.WTF) throw e; }
 	return ({SheetNames:[],Sheets:{}});
 }

 var _RLEN = { 'B': 8, 'C': 250, 'L': 1, 'D': 8, '?': 0, '': 0 };
 function sheet_to_dbf(ws/*:Worksheet*/, opts/*:WriteOpts*/) {
-	if(!ws["!ref"]) throw new Error("Cannot export empty sheet to DBF");
 	var o = opts || {};
-	var old_cp = current_codepage;
 	if(+o.codepage >= 0) set_cp(+o.codepage);
 	if(o.type == "string") throw new Error("Cannot write DBF to JS string");
 	var ba = buf_array();
@ -290,8 +282,7 @@ function sheet_to_dbf(ws/*:Worksheet*/, opts/*:WriteOpts*/) {
 				case 'object': _guess = col[j] instanceof Date ? 'D' : 'C'; break;
 				default: _guess = 'C';
 			}
-			/* TODO: cache the values instead of encoding twice */
-			maxlen = Math.max(maxlen, (typeof $cptable !== "undefined" && typeof col[j] == "string" ? $cptable.utils.encode(current_ansi, col[j]): String(col[j])).length);
+			maxlen = Math.max(maxlen, String(col[j]).length);
 			guess = guess && guess != _guess ? 'C' : _guess;
 			//if(guess == 'C') break;
 		}
@ -317,17 +308,11 @@ function sheet_to_dbf(ws/*:Worksheet*/, opts/*:WriteOpts*/) {
 	h.write_shift(2, 296 + 32 * hcnt);
 	h.write_shift(2, rlen);
 	for(i=0; i < 4; ++i) h.write_shift(4, 0);
-	var cp = +dbf_reverse_map[/*::String(*/current_codepage/*::)*/] || 0x03;
-	h.write_shift(4, 0x00000000 | (cp<<8));
-	if(dbf_codepage_map[cp] != +o.codepage) {
-		if(o.codepage) console.error("DBF Unsupported codepage " + current_codepage + ", using 1252");
-		current_codepage = 1252;
-	}
+	h.write_shift(4, 0x00000000 | ((+dbf_reverse_map[/*::String(*/current_ansi/*::)*/] || 0x03)<<8));

 	for(i = 0, j = 0; i < headers.length; ++i) {
 		if(headers[i] == null) continue;
 		var hf = ba.next(32);
-		/* TODO: test how applications handle non-ASCII field names */
 		var _f = (headers[i].slice(-10) + "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00").slice(0, 11);
 		hf.write_shift(1, _f, "sbcs");
 		hf.write_shift(1, coltypes[i] == '?' ? 'C' : coltypes[i], "sbcs");
@ -356,7 +341,6 @@ function sheet_to_dbf(ws/*:Worksheet*/, opts/*:WriteOpts*/) {
 				case 'N':
 					var _n = "0";
 					if(typeof data[i][j] == "number") _n = data[i][j].toFixed(coldecimals[j]||0);
-					if(_n.length > colwidths[j]) _n = _n.slice(0, colwidths[j]); // addresses decimal > width
 					for(hcnt=0; hcnt < colwidths[j]-_n.length; ++hcnt) rout.write_shift(1, 0x20);
 					rout.write_shift(1, _n, "sbcs");
 					break;
@ -368,16 +352,13 @@ function sheet_to_dbf(ws/*:Worksheet*/, opts/*:WriteOpts*/) {
 						rout.write_shift(2, ("00"+data[i][j].getDate()).slice(-2), "sbcs");
 					} break;
 				case 'C':
-					var _l = rout.l;
 					var _s = String(data[i][j] != null ? data[i][j] : "").slice(0, colwidths[j]);
-					rout.write_shift(1, _s, "cpstr");
-					_l += colwidths[j] - rout.l;
-					for(hcnt=0; hcnt < _l; ++hcnt) rout.write_shift(1, 0x20); break;
+					rout.write_shift(1, _s, "sbcs");
+					for(hcnt=0; hcnt < colwidths[j]-_s.length; ++hcnt) rout.write_shift(1, 0x20); break;
 			}
 		}
 		// data
 	}
-	current_codepage = old_cp;
 	ba.next(1).write_shift(1, 0x1A);
 	return ba.end();
 }
@ -410,15 +391,10 @@ var SYLK = /*#__PURE__*/(function() {
 		"!":161, '"':162, "#":163, "(":164, "%":165, "'":167, "H ":168,
 		"+":171, ";":187, "<":188, "=":189, ">":190, "?":191, "{":223
 	}/*:any*/);
-	var sylk_char_regex = new RegExp("\u001BN(" + keys(sylk_escapes).join("|").replace(/\|\|\|/, "|\\||").replace(/([?()+])/g,"\\$1").replace("{", "\\{") + "|\\|)", "gm");
-	try {
-		sylk_char_regex = new RegExp("\u001BN(" + keys(sylk_escapes).join("|").replace(/\|\|\|/, "|\\||").replace(/([?()+])/g,"\\$1") + "|\\|)", "gm");
-	} catch(e) {}
+	var sylk_char_regex = new RegExp("\u001BN(" + keys(sylk_escapes).join("|").replace(/\|\|\|/, "|\\||").replace(/([?()+])/g,"\\$1") + "|\\|)", "gm");
 	var sylk_char_fn = function(_, $1){ var o = sylk_escapes[$1]; return typeof o == "number" ? _getansi(o) : o; };
 	var decode_sylk_char = function($$, $1, $2) { var newcc = (($1.charCodeAt(0) - 0x20)<<4) | ($2.charCodeAt(0) - 0x30); return newcc == 59 ? $$ : _getansi(newcc); };
 	sylk_escapes["|"] = 254;
-	/* TODO: evert the escape map */
-	var encode_sylk_str = function($$) { return $$.replace(/\n/g, "\x1b :").replace(/\r/g, "\x1b ="); };
 	/* https://oss.sheetjs.com/notes/sylk/ for more details */
 	function sylk_to_aoa(d/*:RawData*/, opts)/*:[AOA, Worksheet]*/ {
 		switch(opts.type) {
@ -471,9 +447,8 @@ var SYLK = /*#__PURE__*/(function() {
 			// case 'NU': // ??
 			case 'C': /* cell */
 			var C_seen_K = false, C_seen_X = false, C_seen_S = false, C_seen_E = false, _R = -1, _C = -1, formula = "", cell_t = "z";
-			var cmnt = "";
 			for(rj=1; rj<record.length; ++rj) switch(record[rj].charAt(0)) {
-				case 'A': cmnt = record[rj].slice(1); break; // TODO: comment
+				case 'A': break; // TODO: comment
 				case 'X': C = parseInt(record[rj].slice(1), 10)-1; C_seen_X = true; break;
 				case 'Y':
 					R = parseInt(record[rj].slice(1), 10)-1; if(!C_seen_X) C = 0;
@ -485,9 +460,10 @@ var SYLK = /*#__PURE__*/(function() {
 					else if(val === 'TRUE' || val === 'FALSE') { val = val === 'TRUE'; cell_t = "b"; }
 					else if(!isNaN(fuzzynum(val))) {
 						val = fuzzynum(val); cell_t = "n";
-						if(next_cell_format !== null && fmt_is_date(next_cell_format) && opts.cellDates) {
-							val = numdate(wb.Workbook.WBProps.date1904 ? val + 1462 : val); cell_t = typeof val == "number" ? "n" : "d";
-						}
+						if(next_cell_format !== null && fmt_is_date(next_cell_format) && opts.cellDates) { val = numdate(wb.Workbook.WBProps.date1904 ? val + 1462 : val); cell_t = "d"; }
+					} else if(!isNaN(fuzzydate(val).getDate())) {
+						val = parseDate(val); cell_t = "d";
+						if(!opts.cellDates) { cell_t = "n"; val = datenum(val, wb.Workbook.WBProps.date1904); }
 					}
 					if(typeof $cptable !== 'undefined' && typeof val == "string" && ((opts||{}).type != "string") && (opts||{}).codepage) val = $cptable.utils.decode(opts.codepage, val);
 					C_seen_K = true;
@ -523,10 +499,6 @@ var SYLK = /*#__PURE__*/(function() {
 				if(!arr[R][C]) arr[R][C] = { t: 'n', f: formula };
 				else arr[R][C].f = formula;
 			}
-			if(cmnt) {
-				if(!arr[R][C]) arr[R][C] = { t: 'z' };
-				arr[R][C].c = [{a:"SheetJSYLK", t: cmnt}];
-			}
 			break;
 			case 'F': /* Format */
 			var F_seen = 0;
@ -588,7 +560,7 @@ var SYLK = /*#__PURE__*/(function() {
 		return outwb;
 	}

-	function write_ws_cell_sylk(cell/*:Cell*/, ws/*:Worksheet*/, R/*:number*/, C/*:number*/, opts, date1904/*:boolean*/)/*:string*/ {
+	function write_ws_cell_sylk(cell/*:Cell*/, ws/*:Worksheet*/, R/*:number*/, C/*:number*//*::, opts*/)/*:string*/ {
 		var o = "C;Y" + (R+1) + ";X" + (C+1) + ";K";
 		switch(cell.t) {
 			case 'n':
@ -596,19 +568,12 @@ var SYLK = /*#__PURE__*/(function() {
 				if(cell.f && !cell.F) o += ";E" + a1_to_rc(cell.f, {r:R, c:C}); break;
 			case 'b': o += cell.v ? "TRUE" : "FALSE"; break;
 			case 'e': o += cell.w || cell.v; break;
-			case 'd': o += datenum(parseDate(cell.v, date1904), date1904); break;
-			case 's': o += '"' + (cell.v == null ? "" : String(cell.v)).replace(/"/g,"").replace(/;/g, ";;") + '"'; break;
+			case 'd': o += '"' + (cell.w || cell.v) + '"'; break;
+			case 's': o += '"' + cell.v.replace(/"/g,"").replace(/;/g, ";;") + '"'; break;
 		}
 		return o;
 	}

-	function write_ws_cmnt_sylk(cmnt/*:Comment*/, R/*:number*/, C/*:number*/)/*:string*/ {
-		var o = "C;Y" + (R+1) + ";X" + (C+1) + ";A";
-		/* TODO: max length? */
-		o += encode_sylk_str(cmnt.map(function(c) { return c.t; }).join(""));
-		return o;
-	}
-
 	function write_ws_cols_sylk(out, cols) {
 		cols.forEach(function(col, i) {
 			var rec = "F;W" + (i+1) + " " + (i+1) + " ";
@ -633,52 +598,29 @@ var SYLK = /*#__PURE__*/(function() {
 	}

 	function sheet_to_sylk(ws/*:Worksheet*/, opts/*:?any*/, wb/*:?WorkBook*/)/*:string*/ {
-		if(!opts) opts = {}; opts._formats = ["General"];
-		/* TODO: codepage */
 		var preamble/*:Array<string>*/ = ["ID;PSheetJS;N;E"], o/*:Array<string>*/ = [];
-		var r = safe_decode_range(ws['!ref']||"A1"), cell/*:Cell*/;
-		var dense = ws["!data"] != null;
+		var r = safe_decode_range(ws['!ref']), cell/*:Cell*/;
+		var dense = Array.isArray(ws);
 		var RS = "\r\n";
 		var d1904 = (((wb||{}).Workbook||{}).WBProps||{}).date1904;

-		var _lastfmt = "General";
 		preamble.push("P;PGeneral");
-		/* Excel has been inconsistent in comment placement */
-		var R = r.s.r, C = r.s.c, p = [];
-		if(ws["!ref"]) for(R = r.s.r; R <= r.e.r; ++R) {
-			if(dense && !ws["!data"][R]) continue;
-			p = [];
-			for(C = r.s.c; C <= r.e.c; ++C) {
-				cell = dense ? ws["!data"][R][C] : ws[encode_col(C) + encode_row(R)];
-				if(!cell || !cell.c) continue;
-				p.push(write_ws_cmnt_sylk(cell.c, R, C));
-			}
-			if(p.length) o.push(p.join(RS));
-		}
-		if(ws["!ref"]) for(R = r.s.r; R <= r.e.r; ++R) {
-			if(dense && !ws["!data"][R]) continue;
-			p = [];
-			for(C = r.s.c; C <= r.e.c; ++C) {
-				cell = dense ? ws["!data"][R][C] : ws[encode_col(C) + encode_row(R)];
-				if(!cell || (cell.v == null && (!cell.f || cell.F))) continue;
-				if((cell.z||(cell.t == "d" ? table_fmt[14] : "General")) != _lastfmt) {
-					var ifmt = opts._formats.indexOf(cell.z);
-					if(ifmt == -1) { opts._formats.push(cell.z); ifmt = opts._formats.length - 1; preamble.push("P;P" + cell.z.replace(/;/g, ";;")); }
-					p.push("F;P" + ifmt + ";Y" + (R+1) + ";X" + (C+1));
-				}
-				p.push(write_ws_cell_sylk(cell, ws, R, C, opts, d1904));
-			}
-			o.push(p.join(RS));
-		}
-
 		preamble.push("F;P0;DG0G8;M255");
 		if(ws['!cols']) write_ws_cols_sylk(preamble, ws['!cols']);
 		if(ws['!rows']) write_ws_rows_sylk(preamble, ws['!rows']);

-		if(ws["!ref"]) preamble.push("B;Y" + (r.e.r - r.s.r + 1) + ";X" + (r.e.c - r.s.c + 1) + ";D" + [r.s.c,r.s.r,r.e.c,r.e.r].join(" "));
+		preamble.push("B;Y" + (r.e.r - r.s.r + 1) + ";X" + (r.e.c - r.s.c + 1) + ";D" + [r.s.c,r.s.r,r.e.c,r.e.r].join(" "));
 		preamble.push("O;L;D;B" + (d1904 ? ";V4" : "") + ";K47;G100 0.001");
-
-		delete opts._formats;
+		for(var R = r.s.r; R <= r.e.r; ++R) {
+			var p = [];
+			for(var C = r.s.c; C <= r.e.c; ++C) {
+				var coord = encode_cell({r:R,c:C});
+				cell = dense ? (ws[R]||[])[C]: ws[coord];
+				if(!cell || (cell.v == null && (!cell.f || cell.F))) continue;
+				p.push(write_ws_cell_sylk(cell, ws, R, C, opts)); // TODO: pass date1904 info
+			}
+			o.push(p.join(RS));
+		}
 		return preamble.join(RS) + RS + o.join(RS) + RS + "E" + RS;
 	}

@ -718,10 +660,7 @@ var DIF = /*#__PURE__*/(function() {
 					if(data === 'TRUE') arr[R][C] = true;
 					else if(data === 'FALSE') arr[R][C] = false;
 					else if(!isNaN(fuzzynum(value))) arr[R][C] = fuzzynum(value);
-					else if(!isNaN(fuzzydate(value).getDate())) {
-						arr[R][C] = parseDate(value);
-						if(!(opts && opts.UTC)) { arr[R][C] = utc_to_local(arr[R][C]); }
-					}
+					else if(!isNaN(fuzzydate(value).getDate())) arr[R][C] = parseDate(value);
 					else arr[R][C] = value;
 					++C; break;
 				case 1:
@ -744,56 +683,62 @@ var DIF = /*#__PURE__*/(function() {
 		return o;
 	}

-	function make_value(v/*:number*/, s/*:string*/)/*:string*/ { return "0," + String(v) + "\r\n" + s; }
-	function make_value_str(s/*:string*/)/*:string*/ { return "1,0\r\n\"" + s.replace(/"/g,'""') + '"'; }
-	function sheet_to_dif(ws/*:Worksheet*//*::, opts:?any*/)/*:string*/ {
-		var _DIF_XL = DIF_XL;
-		if(!ws["!ref"]) throw new Error("Cannot export empty sheet to DIF");
-		var r = safe_decode_range(ws['!ref']);
-		var dense = ws["!data"] != null;
-		var o/*:Array<string>*/ = [
-			"TABLE\r\n0,1\r\n\"sheetjs\"\r\n",
-			"VECTORS\r\n0," + (r.e.r - r.s.r + 1) + "\r\n\"\"\r\n",
-			"TUPLES\r\n0," + (r.e.c - r.s.c + 1) + "\r\n\"\"\r\n",
-			"DATA\r\n0,0\r\n\"\"\r\n"
-		];
-		for(var R = r.s.r; R <= r.e.r; ++R) {
-			var row = dense ? ws["!data"][R] : [];
-			var p = "-1,0\r\nBOT\r\n";
-			for(var C = r.s.c; C <= r.e.c; ++C) {
-				var cell/*:Cell*/ = dense ? (row && row[C]) : ws[encode_cell({r:R,c:C})];
-				if(cell == null) { p +=("1,0\r\n\"\"\r\n"); continue;}
-				switch(cell.t) {
-					case 'n':
-						if(_DIF_XL) {
-							if(cell.w != null) p +=("0," + cell.w + "\r\nV");
-							else if(cell.v != null) p +=(make_value(cell.v, "V")); // TODO: should this call SSF_format?
-							else if(cell.f != null && !cell.F) p +=(make_value_str("=" + cell.f));
-							else p +=("1,0\r\n\"\"");
-						} else {
-							if(cell.v == null) p +=("1,0\r\n\"\"");
-							else p +=(make_value(cell.v, "V"));
-						}
-						break;
-					case 'b':
-						p +=(cell.v ? make_value(1, "TRUE") : make_value(0, "FALSE"));
-						break;
-					case 's':
-						p +=(make_value_str((!_DIF_XL || isNaN(+cell.v)) ? cell.v : '="' + cell.v + '"'));
-						break;
-					case 'd':
-						if(!cell.w) cell.w = SSF_format(cell.z || table_fmt[14], datenum(parseDate(cell.v)));
-						if(_DIF_XL) p +=(make_value(cell.w, "V"));
-						else p +=(make_value_str(cell.w));
-						break;
-					default: p +=("1,0\r\n\"\"");
+	var sheet_to_dif = /*#__PURE__*/(function() {
+		var push_field = function pf(o/*:Array<string>*/, topic/*:string*/, v/*:number*/, n/*:number*/, s/*:string*/) {
+			o.push(topic);
+			o.push(v + "," + n);
+			o.push('"' + s.replace(/"/g,'""') + '"');
+		};
+		var push_value = function po(o/*:Array<string>*/, type/*:number*/, v/*:any*/, s/*:string*/) {
+			o.push(type + "," + v);
+			o.push(type == 1 ? '"' + s.replace(/"/g,'""') + '"' : s);
+		};
+		return function sheet_to_dif(ws/*:Worksheet*//*::, opts:?any*/)/*:string*/ {
+			var o/*:Array<string>*/ = [];
+			var r = safe_decode_range(ws['!ref']), cell/*:Cell*/;
+			var dense = Array.isArray(ws);
+			push_field(o, "TABLE", 0, 1, "sheetjs");
+			push_field(o, "VECTORS", 0, r.e.r - r.s.r + 1,"");
+			push_field(o, "TUPLES", 0, r.e.c - r.s.c + 1,"");
+			push_field(o, "DATA", 0, 0,"");
+			for(var R = r.s.r; R <= r.e.r; ++R) {
+				push_value(o, -1, 0, "BOT");
+				for(var C = r.s.c; C <= r.e.c; ++C) {
+					var coord = encode_cell({r:R,c:C});
+					cell = dense ? (ws[R]||[])[C] : ws[coord];
+					if(!cell) { push_value(o, 1, 0, ""); continue;}
+					switch(cell.t) {
+						case 'n':
+							var val = DIF_XL ? cell.w : cell.v;
+							if(!val && cell.v != null) val = cell.v;
+							if(val == null) {
+								if(DIF_XL && cell.f && !cell.F) push_value(o, 1, 0, "=" + cell.f);
+								else push_value(o, 1, 0, "");
+							}
+							else push_value(o, 0, val, "V");
+							break;
+						case 'b':
+							push_value(o, 0, cell.v ? 1 : 0, cell.v ? "TRUE" : "FALSE");
+							break;
+						case 's':
+							push_value(o, 1, 0, (!DIF_XL || isNaN(cell.v)) ? cell.v : '="' + cell.v + '"');
+							break;
+						case 'd':
+							if(!cell.w) cell.w = SSF_format(cell.z || table_fmt[14], datenum(parseDate(cell.v)));
+							if(DIF_XL) push_value(o, 0, cell.w, "V");
+							else push_value(o, 1, 0, cell.w);
+							break;
+						default: push_value(o, 1, 0, "");
+					}
 				}
-				p += "\r\n";
 			}
-			o.push(p);
-		}
-		return o.join("") + "-1,0\r\nEOD";
-	}
+			push_value(o, -1, 0, "EOD");
+			var RS = "\r\n";
+			var oo = o.join(RS);
+			//while((oo.length & 0x7F) != 0) oo += "\0";
+			return oo;
+		};
+	})();
 	return {
 		to_workbook: dif_to_workbook,
 		to_sheet: dif_to_sheet,
@ -856,11 +801,11 @@ var ETH = /*#__PURE__*/(function() {
 		if(!ws || !ws['!ref']) return "";
 		var o/*:Array<string>*/ = [], oo/*:Array<string>*/ = [], cell, coord = "";
 		var r = decode_range(ws['!ref']);
-		var dense = ws["!data"] != null;
+		var dense = Array.isArray(ws);
 		for(var R = r.s.r; R <= r.e.r; ++R) {
 			for(var C = r.s.c; C <= r.e.c; ++C) {
 				coord = encode_cell({r:R,c:C});
-				cell = dense ? (ws["!data"][R]||[])[C] : ws[coord];
+				cell = dense ? (ws[R]||[])[C] : ws[coord];
 				if(!cell || cell.v == null || cell.t === 'z') continue;
 				oo = ["cell", coord, 't'];
 				switch(cell.t) {
@ -982,8 +927,7 @@ var PRN = /*#__PURE__*/(function() {
 		var o = opts || {};
 		var sep = "";
 		if(DENSE != null && o.dense == null) o.dense = DENSE;
-		var ws/*:Worksheet*/ = ({}/*:any*/);
-		if(o.dense) ws["!data"] = [];
+		var ws/*:Worksheet*/ = o.dense ? ([]/*:any*/) : ({}/*:any*/);
 		var range/*:Range*/ = ({s: {c:0, r:0}, e: {c:0, r:0}}/*:any*/);

 		if(str.slice(0,4) == "sep=") {
@ -1003,35 +947,33 @@ var PRN = /*#__PURE__*/(function() {
 		var start = 0, end = 0, sepcc = sep.charCodeAt(0), instr = false, cc=0, startcc=str.charCodeAt(0);
 		var _re/*:?RegExp*/ = o.dateNF != null ? dateNF_regex(o.dateNF) : null;
 		function finish_cell() {
-			/* TODO: fuzzy parsers should pass back assumed number format */
 			var s = str.slice(start, end); if(s.slice(-1) == "\r") s = s.slice(0, -1);
 			var cell = ({}/*:any*/);
 			if(s.charAt(0) == '"' && s.charAt(s.length - 1) == '"') s = s.slice(1,-1).replace(/""/g,'"');
-			if(o.cellText !== false) cell.w = s;
 			if(s.length === 0) cell.t = 'z';
 			else if(o.raw) { cell.t = 's'; cell.v = s; }
 			else if(s.trim().length === 0) { cell.t = 's'; cell.v = s; }
 			else if(s.charCodeAt(0) == 0x3D) {
 				if(s.charCodeAt(1) == 0x22 && s.charCodeAt(s.length - 1) == 0x22) { cell.t = 's'; cell.v = s.slice(2,-1).replace(/""/g,'"'); }
-				else if(fuzzyfmla(s)) { cell.t = 's'; cell.f = s.slice(1); cell.v = s; }
+				else if(fuzzyfmla(s)) { cell.t = 'n'; cell.f = s.slice(1); }
 				else { cell.t = 's'; cell.v = s; } }
 			else if(s == "TRUE") { cell.t = 'b'; cell.v = true; }
 			else if(s == "FALSE") { cell.t = 'b'; cell.v = false; }
-			else if(!isNaN(v = fuzzynum(s))) { cell.t = 'n'; cell.v = v; }
+			else if(!isNaN(v = fuzzynum(s))) { cell.t = 'n'; if(o.cellText !== false) cell.w = s; cell.v = v; }
 			else if(!isNaN((v = fuzzydate(s)).getDate()) || _re && s.match(_re)) {
 				cell.z = o.dateNF || table_fmt[14];
-				if(_re && s.match(_re)){ var news=dateNF_fix(s, o.dateNF, (s.match(_re)||[])); v = parseDate(news); if(o && o.UTC === false) v = utc_to_local(v); }
-				else if(o && o.UTC === false) v = utc_to_local(v);
-				else if(o.cellText !== false && o.dateNF) cell.w = SSF_format(cell.z, v);
+				var k = 0;
+				if(_re && s.match(_re)){ s=dateNF_fix(s, o.dateNF, (s.match(_re)||[])); k=1; v = parseDate(s, k); }
 				if(o.cellDates) { cell.t = 'd'; cell.v = v; }
 				else { cell.t = 'n'; cell.v = datenum(v); }
+				if(o.cellText !== false) cell.w = SSF_format(cell.z, cell.v instanceof Date ? datenum(cell.v):cell.v);
 				if(!o.cellNF) delete cell.z;
 			} else {
 				cell.t = 's';
 				cell.v = s;
 			}
 			if(cell.t == 'z'){}
-			else if(o.dense) { if(!ws["!data"][R]) ws["!data"][R] = []; ws["!data"][R][C] = cell; }
+			else if(o.dense) { if(!ws[R]) ws[R] = []; ws[R][C] = cell; }
 			else ws[encode_cell({c:C,r:R})] = cell;
 			start = end+1; startcc = str.charCodeAt(start);
 			if(range.e.c < C) range.e.c = C;
@ -1086,14 +1028,13 @@ var PRN = /*#__PURE__*/(function() {

 	function sheet_to_prn(ws/*:Worksheet*//*::, opts:?any*/)/*:string*/ {
 		var o/*:Array<string>*/ = [];
-		if(!ws["!ref"]) return "";
 		var r = safe_decode_range(ws['!ref']), cell/*:Cell*/;
-		var dense = ws["!data"] != null;
+		var dense = Array.isArray(ws);
 		for(var R = r.s.r; R <= r.e.r; ++R) {
 			var oo/*:Array<string>*/ = [];
 			for(var C = r.s.c; C <= r.e.c; ++C) {
 				var coord = encode_cell({r:R,c:C});
-				cell = dense ? (ws["!data"][R]||[])[C] : ws[coord];
+				cell = dense ? (ws[R]||[])[C] : ws[coord];
 				if(!cell || cell.v == null) { oo.push("          "); continue; }
 				var w = (cell.w || (format_cell(cell), cell.w) || "").slice(0,10);
 				while(w.length < 10) w += " ";
--- a/bits/41_lotus.js
+++ b/bits/41_lotus.js
@ -24,33 +24,15 @@ var WK_ = /*#__PURE__*/(function() {
 		throw "Unsupported type " + opts.type;
 	}

-	/* NOTE: this list intentionally starts at 1 */
-	var LOTUS_DATE_FMTS = [
-		"mmmm",
-		"dd-mmm-yyyy",
-		"dd-mmm",
-		"mmm-yyyy",
-		"@", // "text"?
-		"mm/dd",
-		"hh:mm:ss AM/PM", // 7
-		"hh:mm AM/PM",
-		"mm/dd/yyyy",
-		"mm/dd",
-		"hh:mm:ss",
-		"hh:mm" // 12
-	];
-
 	function lotus_to_workbook_buf(d, opts)/*:Workbook*/ {
 		if(!d) return d;
 		var o = opts || {};
 		if(DENSE != null && o.dense == null) o.dense = DENSE;
-		var s/*:Worksheet*/ = ({}/*:any*/), n = "Sheet1", next_n = "", sidx = 0;
-		var sheets = {}, snames = [], realnames = [], sdata = [];
-		if(o.dense) sdata = s["!data"] = [];
+		var s/*:Worksheet*/ = ((o.dense ? [] : {})/*:any*/), n = "Sheet1", next_n = "", sidx = 0;
+		var sheets = {}, snames = [], realnames = [];

 		var refguess = {s: {r:0, c:0}, e: {r:0, c:0} };
 		var sheetRows = o.sheetRows || 0;
-		var lastcell = {};

 		if(d[4] == 0x51 && d[5] == 0x50 && d[6] == 0x57) return qpw_to_workbook_buf(d, opts);
 		if(d[2] == 0x00) {
@ -82,9 +64,9 @@ var WK_ = /*#__PURE__*/(function() {
 				case 0x0E: /* NUMBER */
 				case 0x10: /* FORMULA */
 					/* TODO: actual translation of the format code */
-					if((val[2] & 0x70) == 0x70 && (val[2] & 0x0F) > 1 && (val[2] & 0x0F) < 15) {
-						val[1].z = o.dateNF || LOTUS_DATE_FMTS[(val[2] & 0x0F)-1] || table_fmt[14];
-						if(o.cellDates) { val[1].v = numdate(val[1].v); val[1].t = typeof val[1].v == "number" ? 'n' : 'd'; }
+					if(RT == 0x0E && (val[2] & 0x70) == 0x70 && (val[2] & 0x0F) > 1 && (val[2] & 0x0F) < 15) {
+						val[1].z = o.dateNF || table_fmt[14];
+						if(o.cellDates) { val[1].t = 'd'; val[1].v = numdate(val[1].v); }
 					}

 					if(o.qpro) {
@ -92,36 +74,26 @@ var WK_ = /*#__PURE__*/(function() {
 							s["!ref"] = encode_range(refguess);
 							sheets[n] = s;
 							snames.push(n);
-							s = ({}/*:any*/); if(o.dense) sdata = s["!data"] = [];
+							s = (o.dense ? [] : {});
 							refguess = {s: {r:0, c:0}, e: {r:0, c:0} };
 							sidx = val[3]; n = next_n || "Sheet" + (sidx + 1); next_n = "";
 						}
 					}

-					var tmpcell = o.dense ? (sdata[val[0].r]||[])[val[0].c] : s[encode_cell(val[0])];
+					var tmpcell = o.dense ? (s[val[0].r]||[])[val[0].c] : s[encode_cell(val[0])];
 					if(tmpcell) {
 						tmpcell.t = val[1].t; tmpcell.v = val[1].v;
 						if(val[1].z != null) tmpcell.z = val[1].z;
 						if(val[1].f != null) tmpcell.f = val[1].f;
-						lastcell = tmpcell;
 						break;
 					}
 					if(o.dense) {
-						if(!sdata[val[0].r]) sdata[val[0].r] = [];
-						sdata[val[0].r][val[0].c] = val[1];
+						if(!s[val[0].r]) s[val[0].r] = [];
+						s[val[0].r][val[0].c] = val[1];
 					} else s[encode_cell(val[0])] = val[1];
-					lastcell = val[1];
 					break;
 				case 0x5405: o.works2 = true; break;
-				case 0x5402: {
-					/* TODO: enumerate all extended number formats */
-					if(val == 0x14a1) {
-						lastcell.z = "hh:mm:ss";
-						if(o.cellDates && lastcell.t == "n") {
-							lastcell.v = numdate(lastcell.v); lastcell.t = typeof lastcell.v == "number" ? 'n' : 'd';
-						}
-					}
-				} break;
+				default:
 			}}, o);
 		} else if(d[2] == 0x1A || d[2] == 0x0E) {
 			o.Enum = WK3Enum;
@ -143,14 +115,14 @@ var WK_ = /*#__PURE__*/(function() {
 						s["!ref"] = encode_range(refguess);
 						sheets[n] = s;
 						snames.push(n);
-						s = ({}/*:any*/); if(o.dense) sdata = s["!data"] = [];
+						s = (o.dense ? [] : {});
 						refguess = {s: {r:0, c:0}, e: {r:0, c:0} };
 						sidx = val[3]; n = "Sheet" + (sidx + 1);
 					}
 					if(sheetRows > 0 && val[0].r >= sheetRows) break;
 					if(o.dense) {
-						if(!sdata[val[0].r]) sdata[val[0].r] = [];
-						sdata[val[0].r][val[0].c] = val[1];
+						if(!s[val[0].r]) s[val[0].r] = [];
+						s[val[0].r][val[0].c] = val[1];
 					} else s[encode_cell(val[0])] = val[1];
 					if(refguess.e.c < val[0].c) refguess.e.c = val[0].c;
 					if(refguess.e.r < val[0].r) refguess.e.r = val[0].r;
@ -184,32 +156,25 @@ var WK_ = /*#__PURE__*/(function() {
 		if(+o.codepage >= 0) set_cp(+o.codepage);
 		if(o.type == "string") throw new Error("Cannot write WK1 to JS string");
 		var ba = buf_array();
-		if(!ws["!ref"]) throw new Error("Cannot export empty sheet to WK1");
 		var range = safe_decode_range(ws["!ref"]);
-		var dense = ws["!data"] != null;
+		var dense = Array.isArray(ws);
 		var cols = [];

 		write_biff_rec(ba, 0x00, write_BOF_WK1(0x0406));
 		write_biff_rec(ba, 0x06, write_RANGE(range));
 		var max_R = Math.min(range.e.r, 8191);
-		for(var C = range.s.c; C <= range.e.c; ++C) cols[C] = encode_col(C);
 		for(var R = range.s.r; R <= max_R; ++R) {
 			var rr = encode_row(R);
-			for(C = range.s.c; C <= range.e.c; ++C) {
-				var cell = dense ? (ws["!data"][R]||[])[C] : ws[cols[C] + rr];
+			for(var C = range.s.c; C <= range.e.c; ++C) {
+				if(R === range.s.r) cols[C] = encode_col(C);
+				var ref = cols[C] + rr;
+				var cell = dense ? (ws[R]||[])[C] : ws[ref];
 				if(!cell || cell.t == "z") continue;
 				/* TODO: formula records */
-				switch(cell.t) {
-				case "n":
-					if((cell.v|0)==cell.v && cell.v >= -32768 && cell.v <= 32767) write_biff_rec(ba, 0x0d, write_INTEGER(R, C, cell));
-					else write_biff_rec(ba, 0x0e, write_NUMBER(R, C, cell));
-					break;
-				case "d":
-					var dc = datenum(cell.v);
-					if((dc|0)==dc && dc >= -32768 && dc <= 32767) write_biff_rec(ba, 0x0d, write_INTEGER(R, C, {t:"n", v:dc, z:cell.z || table_fmt[14]}));
-					else write_biff_rec(ba, 0x0e, write_NUMBER(R, C, {t:"n", v:dc, z:cell.z || table_fmt[14]}));
-					break;
-				default:
+				if(cell.t == "n") {
+					if((cell.v|0)==cell.v && cell.v >= -32768 && cell.v <= 32767) write_biff_rec(ba, 0x0d, write_INTEGER(R, C, cell.v));
+					else write_biff_rec(ba, 0x0e, write_NUMBER(R, C, cell.v));
+				} else {
 					var str = format_cell(cell);
 					write_biff_rec(ba, 0x0F, write_LABEL(R, C, str.slice(0, 239)));
 				}
@ -235,7 +200,7 @@ var WK_ = /*#__PURE__*/(function() {
 			var ws = wb.Sheets[wb.SheetNames[i]];
 			if(!ws || !ws["!ref"]) continue;
 			var range = safe_decode_range(ws["!ref"]);
-			var dense = ws["!data"] != null;
+			var dense = Array.isArray(ws);
 			var cols = [];
 			var max_R = Math.min(range.e.r, 8191);
 			for(var R = range.s.r; R <= max_R; ++R) {
@ -243,7 +208,7 @@ var WK_ = /*#__PURE__*/(function() {
 				for(var C = range.s.c; C <= range.e.c; ++C) {
 					if(R === range.s.r) cols[C] = encode_col(C);
 					var ref = cols[C] + rr;
-					var cell = dense ? (ws["!data"][R]||[])[C] : ws[ref];
+					var cell = dense ? (ws[R]||[])[C] : ws[ref];
 					if(!cell || cell.t == "z") continue;
 					/* TODO: FORMULA19 NUMBER18 records */
 					if(cell.t == "n") {
@ -343,18 +308,11 @@ var WK_ = /*#__PURE__*/(function() {
 		return o;
 	}

-	function get_wk1_fmt(cell)/*:number*/ {
-		/* TODO: some fuzzy matching on the number format */
-		if(cell.z && fmt_is_date(cell.z)) {
-			return 0xf0 | (LOTUS_DATE_FMTS.indexOf(cell.z) + 1 || 2);
-		}
-		return 0xFF;
-	}
 	function parse_LABEL(blob, length, opts) {
 		var tgt = blob.l + length;
 		var o = parse_cell(blob, length, opts);
 		o[1].t = 's';
-		if((opts.vers & 0xFFFE) == 0x5120) { // WQ1 / WQ2
+		if(opts.vers == 0x5120) {
 			blob.l++;
 			var len = blob.read_shift(1);
 			o[1].v = blob.read_shift(len, 'utf8');
@ -396,12 +354,12 @@ var WK_ = /*#__PURE__*/(function() {
 		o[1].v = blob.read_shift(2, 'i');
 		return o;
 	}
-	function write_INTEGER(R, C, cell) {
+	function write_INTEGER(R, C, v) {
 		var o = new_buf(7);
-		o.write_shift(1, get_wk1_fmt(cell));
+		o.write_shift(1, 0xFF);
 		o.write_shift(2, C);
 		o.write_shift(2, R);
-		o.write_shift(2, cell.v, 'i');
+		o.write_shift(2, v, 'i');
 		return o;
 	}

@ -410,12 +368,12 @@ var WK_ = /*#__PURE__*/(function() {
 		o[1].v = blob.read_shift(8, 'f');
 		return o;
 	}
-	function write_NUMBER(R, C, cell) {
+	function write_NUMBER(R, C, v) {
 		var o = new_buf(13);
-		o.write_shift(1, get_wk1_fmt(cell));
+		o.write_shift(1, 0xFF);
 		o.write_shift(2, C);
 		o.write_shift(2, R);
-		o.write_shift(8, cell.v, 'f');
+		o.write_shift(8, v, 'f');
 		return o;
 	}

@ -468,7 +426,7 @@ var WK_ = /*#__PURE__*/(function() {
 		0x33: ["FALSE", 0],
 		0x34: ["TRUE", 0],
 		0x35: ["RAND", 0],
-		0x36: ["DATE", 3],
+		// 0x36 DATE
 		// 0x37 NOW
 		// 0x38 PMT
 		// 0x39 PV
@ -478,7 +436,7 @@ var WK_ = /*#__PURE__*/(function() {
 		// 0x3D MONTH
 		// 0x3E YEAR
 		0x3F: ["ROUND", 2],
-		0x40: ["TIME", 3],
+		// 0x40 TIME
 		// 0x41 HOUR
 		// 0x42 MINUTE
 		// 0x43 SECOND
@ -820,24 +778,13 @@ var WK_ = /*#__PURE__*/(function() {
 		/*::[*/0x0048/*::]*/: { n:"ACOMM" },
 		/*::[*/0x0049/*::]*/: { n:"AMACRO" },
 		/*::[*/0x004A/*::]*/: { n:"PARSE" },
-		// 0x0064
 		/*::[*/0x0066/*::]*/: { n:"PRANGES??" },
 		/*::[*/0x0067/*::]*/: { n:"RRANGES??" },
 		/*::[*/0x0068/*::]*/: { n:"FNAME??" },
 		/*::[*/0x0069/*::]*/: { n:"MRANGES??" },
-		// 0x0096
-		// 0x0099
-		// 0x009A
-		// 0x009B
-		// 0x009C
-		// 0x00C0
-		// 0x00C7
-		// 0x00C9
 		/*::[*/0x00CC/*::]*/: { n:"SHEETNAMECS", f:parse_SHEETNAMECS },
-		// 0x00CD
 		/*::[*/0x00DE/*::]*/: { n:"SHEETNAMELP", f:parse_SHEETNAMELP },
 		/*::[*/0x00FF/*::]*/: { n:"BOF", f:parseuint16 },
-		/*::[*/0x5402/*::]*/: { n:"WKSNF", f:parseuint16 },
 		/*::[*/0xFFFF/*::]*/: { n:"" }
 	};

@ -967,47 +914,16 @@ var WK_ = /*#__PURE__*/(function() {
 		/*::[*/0xFFFF/*::]*/: { n:"" }
 	};

-	/* TODO: fill out and verify this table across QP versions */
-	var QPWNFTable = {
-		/*::[*/0x05/*::*/: "dd-mmm-yy",
-		/*::[*/0x06/*::*/: "dd-mmm",
-		/*::[*/0x07/*::*/: "mmm-yy",
-		/*::[*/0x08/*::*/: "mm/dd/yy", // Long Date Intl
-		/*::[*/0x0A/*::*/: "hh:mm:ss AM/PM",
-		/*::[*/0x0B/*::*/: "hh:mm AM/PM",
-		/*::[*/0x0E/*::*/: "dd-mmm-yyyy",
-		/*::[*/0x0F/*::*/: "mmm-yyyy",
-
-		/* It is suspected that the the low nybble specifies decimal places */
-		/*::[*/0x0022/*::*/: "0.00",
-		/*::[*/0x0032/*::*/: "0.00;[Red]0.00",
-		/*::[*/0x0042/*::*/: "0.00;\(0.00\)",
-		/*::[*/0x0052/*::*/: "0.00;[Red]\(0.00\)",
-		/*::[*/0x00A2/*::*/: '"$"#,##0.00;\\("$"#,##0.00\\)',
-		/*::[*/0x0120/*::*/: '0%',
-		/*::[*/0x0130/*::*/: '0E+00',
-		/*::[*/0x0140/*::*/: '# ?/?'
-	};
-
-	function parse_qpw_str(p) {
-		var cch = p.read_shift(2);
-		var flags = p.read_shift(1);
-		/* TODO: find examples with nonzero flags */
-		if(flags != 0) throw "unsupported QPW string type " + flags.toString(16);
-		return p.read_shift(cch, "sbcs-cont");
-	}
-
 	/* QPW uses a different set of record types */
 	function qpw_to_workbook_buf(d, opts)/*:Workbook*/ {
 		prep_blob(d, 0);
 		var o = opts || {};
 		if(DENSE != null && o.dense == null) o.dense = DENSE;
-		var s/*:Worksheet*/ = ({}/*:any*/); if(o.dense) s["!data"] = [];
+		var s/*:Worksheet*/ = ((o.dense ? [] : {})/*:any*/);
 		var SST = [], sname = "", formulae = [];
 		var range = {s:{r:-1,c:-1}, e:{r:-1,c:-1}};
 		var cnt = 0, type = 0, C = 0, R = 0;
 		var wb = { SheetNames: [], Sheets: {} };
-		var FMTS = [];
 		outer: while(d.l < d.length) {
 			var RT = d.read_shift(2), length = d.read_shift(2);
 			var p = d.slice(d.l, d.l + length);
@ -1018,22 +934,6 @@ var WK_ = /*#__PURE__*/(function() {
 					break;
 				case 0x02: /* EOF */ break outer;

-				case 0x08: /* NF */ break; // TODO: this is tied to custom number formats
-
-				case 0x0A: /* FORMATS */ {
-					var fcnt = p.read_shift(4);
-					var step = ((p.length - p.l)/ fcnt)|0;
-					for(var ifmt = 0; ifmt < fcnt; ++ifmt) {
-						var end = p.l + step;
-						var fmt = {};
-						p.l += 2;
-						fmt.numFmtId = p.read_shift(2);
-						if(QPWNFTable[fmt.numFmtId]) fmt.z = QPWNFTable[fmt.numFmtId];
-						p.l = end;
-						FMTS.push(fmt);
-					}
-				} break;
-
 				/* TODO: The behavior here should be consistent with Numbers: QP Notebook ~ .TN.SheetArchive, QP Sheet ~ .TST.TableModelArchive */
 				case 0x0401: /* BON */ break;
 				case 0x0402: /* EON */ /* TODO: backfill missing sheets based on BON cnt */ break;
@ -1056,7 +956,7 @@ var WK_ = /*#__PURE__*/(function() {

 				case 0x0601: { /* BOS */
 					var sidx = p.read_shift(2);
-					s = ({}/*:any*/); if(o.dense) s["!data"] = [];
+					s = ((o.dense ? [] : {})/*:any*/);
 					range.s.c = p.read_shift(2);
 					range.e.c = p.read_shift(2);
 					range.s.r = p.read_shift(4);
@ -1093,28 +993,20 @@ var WK_ = /*#__PURE__*/(function() {
 					R = p.read_shift(4), cnt = p.read_shift(4);
 					if(range.s.r > R) range.s.r = R;
 					if(range.e.r < R + cnt - 1) range.e.r = R + cnt - 1;
-					var CC = encode_col(C);
 					while(p.l < p.length) {
 						var cell = { t: "z" };
-						var flags = p.read_shift(1), fmtidx = -1;
-						if(flags & 0x80) fmtidx = p.read_shift(2);
+						var flags = p.read_shift(1);
+						if(flags & 0x80) p.l += 2;
 						var mul = (flags & 0x40) ? p.read_shift(2) - 1: 0;
 						switch(flags & 0x1F) {
-							case 0: break;
 							case 1: break;
 							case 2: cell = { t: "n", v: p.read_shift(2) }; break;
 							case 3: cell = { t: "n", v: p.read_shift(2, 'i') }; break;
-							case 4: cell = { t: "n", v: parse_RkNumber(p) }; break;
 							case 5: cell = { t: "n", v: p.read_shift(8, 'f') }; break;
 							case 7: cell = { t: "s", v: SST[type = p.read_shift(4) - 1] }; break;
-							case 8:
-								cell = { t: "n", v: p.read_shift(8, 'f') };
-								p.l += 2; /* cell.f = formulae[p.read_shift(4)]; */ p.l += 4;
-								if(isNaN(cell.v)) cell = { t: "e", v: 0x0F }; // #VALUE!
-								break;
+							case 8: cell = { t: "n", v: p.read_shift(8, 'f') }; p.l += 2; /* cell.f = formulae[p.read_shift(4)]; */ p.l += 4; break;
 							default: throw "Unrecognized QPW cell type " + (flags & 0x1F);
 						}
-						if(fmtidx != -1 && (FMTS[fmtidx - 1]||{}).z) cell.z = FMTS[fmtidx-1].z;
 						var delta = 0;
 						if(flags & 0x20) switch(flags & 0x1F) {
 							case 2: delta = p.read_shift(2); break;
@ -1123,14 +1015,10 @@ var WK_ = /*#__PURE__*/(function() {
 							default: throw "Unsupported delta for QPW cell type " + (flags & 0x1F);
 						}
 						if(!(!o.sheetStubs && cell.t == "z")) {
-							var newcell = dup(cell);
-							if(cell.t == "n" && cell.z && fmt_is_date(cell.z) && o.cellDates) {
-								newcell.v = numdate(cell.v); newcell.t = typeof newcell.v == "number" ? 'n' : 'd';
-							}
-							if(s["!data"] != null) {
-								if(!s["!data"][R]) s["!data"][R] = [];
-								s["!data"][R][C] = newcell;
-							} else s[CC + encode_row(R)] = newcell;
+							if(Array.isArray(s)) {
+								if(!s[R]) s[R] = [];
+								s[R][C] = cell;
+							} else s[encode_cell({r:R, c:C})] = cell;
 						}
 						++R; --cnt;
 						while(mul-- > 0 && cnt >= 0) {
@ -1145,29 +1033,17 @@ var WK_ = /*#__PURE__*/(function() {
 								case 7: cell = { t: "s", v: SST[type = p.read_shift(4) - 1] }; break;
 								default: throw "Cannot apply repeat for QPW cell type " + (flags & 0x1F);
 							}
-							if(fmtidx != -1);
 							if(!(!o.sheetStubs && cell.t == "z")) {
-								if(s["!data"] != null) {
-									if(!s["!data"][R]) s["!data"][R] = [];
-									s["!data"][R][C] = cell;
-								} else s[CC + encode_row(R)] = cell;
+								if(Array.isArray(s)) {
+									if(!s[R]) s[R] = [];
+									s[R][C] = cell;
+								} else s[encode_cell({r:R, c:C})] = cell;
 							}
 							++R; --cnt;
 						}
 					}
 				} break;

-				case 0x0C02: { /* String (result of string formula expression) */
-					C = p.read_shift(2);
-					R = p.read_shift(4);
-					var str = parse_qpw_str(p);
-					/* TODO: QP10 record has an additional unknown character after the string */
-					if(s["!data"] != null) {
-						if(!s["!data"][R]) s["!data"][R] = [];
-						s["!data"][R][C] = { t:"s", v:str };
-					} else s[encode_col(C) + encode_row(R)] = { t:"s", v:str };
-				} break;
-
 				default: break;
 			}
 			d.l += length;
--- a/bits/42_sstxml.js
+++ b/bits/42_sstxml.js
@ -168,7 +168,7 @@ var rs_to_html = /*#__PURE__*/(function parse_rs_factory() {
 })();

 /* 18.4.8 si CT_Rst */
-var sitregex = /<(?:\w+:)?t[^>]*>([^<]*)<\/(?:\w+:)?t>/g, sirregex = /<(?:\w+:)?r\b[^>]*>/;
+var sitregex = /<(?:\w+:)?t[^>]*>([^<]*)<\/(?:\w+:)?t>/g, sirregex = /<(?:\w+:)?r>/;
 var sirphregex = /<(?:\w+:)?rPh.*?>([\s\S]*?)<\/(?:\w+:)?rPh>/g;
 function parse_si(x, opts) {
 	var html = opts ? opts.cellHTML : true;
@ -229,7 +229,6 @@ function write_sst_xml(sst/*:SST*/, opts)/*:string*/ {
 		else {
 			sitag += "<t";
 			if(!s.t) s.t = "";
-			if(typeof s.t !== "string") s.t = String(s.t);
 			if(s.t.match(straywsregex)) sitag += ' xml:space="preserve"';
 			sitag += ">" + escapexml(s.t) + "</t>";
 		}
--- a/bits/45_rtf.js
+++ b/bits/45_rtf.js
@ -13,18 +13,14 @@ function rtf_to_sheet(d, opts) {
 }
 function rtf_to_sheet_str(str, opts) {
  var o = opts || {};
-  var ws = {};
-  var dense = o.dense;
-  if (dense)
-    ws["!data"] = [];
+  var ws = o.dense ? [] : {};
  var rows = str.match(/\\trowd[\s\S]*?\\row\b/g);
  if (!rows)
    throw new Error("RTF missing table");
  var range = { s: { c: 0, r: 0 }, e: { c: 0, r: rows.length - 1 } };
-  var row = [];
  rows.forEach(function(rowtf, R) {
-    if (dense)
-      row = ws["!data"][R] = [];
+    if (Array.isArray(ws))
+      ws[R] = [];
    var rtfre = /\\[\w\-]+\b/g;
    var last_index = 0;
    var res;
@ -50,8 +46,8 @@ function rtf_to_sheet_str(str, opts) {
                cell.w = cell.v;
              cell.v = fuzzynum(cell.v);
            }
-            if (dense)
-              row[C] = cell;
+            if (Array.isArray(ws))
+              ws[R][C] = cell;
            else
              ws[encode_cell({ r: R, c: C })] = cell;
          }
@ -79,17 +75,15 @@ function sheet_to_rtf(ws, opts) {
  if (!ws["!ref"])
    return o[0] + "}";
  var r = safe_decode_range(ws["!ref"]), cell;
-  var dense = ws["!data"] != null, row = [];
+  var dense = Array.isArray(ws);
  for (var R = r.s.r; R <= r.e.r; ++R) {
    o.push("\\trowd\\trautofit1");
    for (var C = r.s.c; C <= r.e.c; ++C)
      o.push("\\cellx" + (C + 1));
    o.push("\\pard\\intbl");
-    if (dense)
-      row = ws["!data"][R] || [];
    for (C = r.s.c; C <= r.e.c; ++C) {
      var coord = encode_cell({ r: R, c: C });
-      cell = dense ? row[C] : ws[coord];
+      cell = dense ? (ws[R] || [])[C] : ws[coord];
      if (!cell || cell.v == null && (!cell.f || cell.F)) {
        o.push(" \\cell");
        continue;
--- a/bits/47_styxml.js
+++ b/bits/47_styxml.js
@ -311,7 +311,7 @@ function parse_cellXfs(t, styles, opts) {
 			case '<cellXfs': case '<cellXfs>': case '<cellXfs/>': case '</cellXfs>': break;

 			/* 18.8.45 xf CT_Xf */
-			case '<xf': case '<xf/>': case '<xf>':
+			case '<xf': case '<xf/>':
 				xf = y;
 				delete xf[0];
 				for(i = 0; i < cellXF_uint.length; ++i) if(xf[cellXF_uint[i]])
@ -325,7 +325,7 @@ function parse_cellXfs(t, styles, opts) {
 			case '</xf>': break;

 			/* 18.8.1 alignment CT_CellAlignment */
-			case '<alignment': case '<alignment/>': case '<alignment>':
+			case '<alignment': case '<alignment/>':
 				var alignment = {};
 				if(y.vertical) alignment.vertical = y.vertical;
 				if(y.horizontal) alignment.horizontal = y.horizontal;
@ -337,12 +337,12 @@ function parse_cellXfs(t, styles, opts) {
 			case '</alignment>': break;

 			/* 18.8.33 protection CT_CellProtection */
-			case '<protection': case '<protection>':
+			case '<protection':
 				break;
 			case '</protection>': case '<protection/>': break;

 			/* note: sometimes mc:AlternateContent appears bare */
-			case '<AlternateContent': case '<AlternateContent>': pass = true; break;
+			case '<AlternateContent': pass = true; break;
 			case '</AlternateContent>': pass = false; break;

 			/* 18.2.10 extLst CT_ExtensionList ? */
--- a/bits/51_xlsxmeta.js
+++ b/bits/51_xlsxmeta.js
@ -71,7 +71,7 @@ function parse_xlmeta_xml(data, name, opts) {
        lastmeta.offsets.push(+y.i);
        break;
      default:
-        if (!pass && (opts == null ? void 0 : opts.WTF))
+        if (!pass && opts.WTF)
          throw new Error("unrecognized " + y[0] + " in metadata");
    }
    return x;
--- a/bits/55_vml.js
+++ b/bits/55_vml.js
@ -1,43 +1,5 @@
 /* L.5.5.2 SpreadsheetML Comments + VML Schema */
-var shapevmlregex = /<(?:\w+:)?shape(?:[^\w][^>]*)?>([\s\S]*?)<\/(?:\w+:)?shape>/g;
-function parse_vml(data/*:string*/, sheet, comments) {
-	var cidx = 0;
-	(data.match(shapevmlregex)||[]).forEach(function(m) {
-		var type = "";
-		var hidden = true;
-		var aidx = -1;
-		var R = -1, C = -1;
-		m.replace(tagregex, function(x/*:string*/, idx/*:number*/) {
-			var y = parsexmltag(x);
-			switch(strip_ns(y[0])) {
-				case '<ClientData': if(y.ObjectType) type = y.ObjectType; break;
-
-				case '<Visible': case '<Visible/>': hidden = false; break;
-
-				case '<Row': case '<Row>': aidx = idx + x.length; break;
-				case '</Row>': R = +m.slice(aidx, idx).trim(); break;
-
-				case '<Column': case '<Column>': aidx = idx + x.length; break;
-				case '</Column>': C = +m.slice(aidx, idx).trim(); break;
-			}
-			return "";
-		});
-		switch(type) {
-		case 'Note':
-			var cell = ws_get_cell_stub(sheet, ((R>=0 && C>=0) ? encode_cell({r:R,c:C}) : comments[cidx].ref));
-			if(cell.c) {
-				cell.c.hidden = hidden;
-			}
-			++cidx;
-			break;
-		}
-
-	});
-}
-
-
-/* comment boxes */
-function write_vml(rId/*:number*/, comments, ws) {
+function write_vml(rId/*:number*/, comments) {
 	var csize = [21600, 21600];
 	/* L.5.2.1.2 Path Attribute */
 	var bbox = ["m0,0l0",csize[1],csize[0],csize[1],csize[0],"0xe"].join(",");
@ -59,7 +21,7 @@ function write_vml(rId/*:number*/, comments, ws) {
 	return o.join("");
 }

-function write_vml_comment(x, _shapeid, ws)/*:string*/ {
+function write_vml_comment(x, _shapeid)/*:string*/ {
 	var c = decode_cell(x[0]);
 	var fillopts = /*::(*/{'color2':"#BEFF82", 'type':"gradient"}/*:: :any)*/;
 	if(fillopts.type == "gradient") fillopts.angle = "-180";
--- a/bits/56_cmntcommon.js
+++ b/bits/56_cmntcommon.js
@ -1,16 +1,15 @@
-function sheet_insert_comments(sheet/*:WorkSheet*/, comments/*:Array<RawComment>*/, threaded/*:boolean*/, people/*:?Array<any>*/) {
-	var dense = sheet["!data"] != null;
+function sheet_insert_comments(sheet, comments/*:Array<RawComment>*/, threaded/*:boolean*/, people/*:?Array<any>*/) {
+	var dense = Array.isArray(sheet);
 	var cell/*:Cell*/;
 	comments.forEach(function(comment) {
 		var r = decode_cell(comment.ref);
-		if(r.r < 0 || r.c < 0) return;
 		if(dense) {
-			if(!sheet["!data"][r.r]) sheet["!data"][r.r] = [];
-			cell = sheet["!data"][r.r][r.c];
+			if(!sheet[r.r]) sheet[r.r] = [];
+			cell = sheet[r.r][r.c];
 		} else cell = sheet[comment.ref];
 		if (!cell) {
 			cell = ({t:"z"}/*:any*/);
-			if(dense) sheet["!data"][r.r][r.c] = cell;
+			if(dense) sheet[r.r][r.c] = cell;
 			else sheet[comment.ref] = cell;
 			var range = safe_decode_range(sheet["!ref"]||"BDWGO1000001:A1");
 			if(range.s.r > r.r) range.s.r = r.r;
@ -18,7 +17,7 @@ function sheet_insert_comments(sheet/*:WorkSheet*/, comments/*:Array<RawComment>
 			if(range.s.c > r.c) range.s.c = r.c;
 			if(range.e.c < r.c) range.e.c = r.c;
 			var encoded = encode_range(range);
-			sheet["!ref"] = encoded;
+			if (encoded !== sheet["!ref"]) sheet["!ref"] = encoded;
 		}

 		if (!cell.c) cell.c = [];
@ -36,3 +35,4 @@ function sheet_insert_comments(sheet/*:WorkSheet*/, comments/*:Array<RawComment>
 		cell.c.push(o);
 	});
 }
+
--- a/bits/57_cmntxml.js
+++ b/bits/57_cmntxml.js
@ -50,28 +50,21 @@ function write_comments_xml(data/*::, opts*/) {
 	o.push("<commentList>");
 	data.forEach(function(d) {
 		/* 18.7.3 CT_Comment */
-		var lastauthor = 0, ts = [], tcnt = 0;
+		var lastauthor = 0, ts = [];
 		if(d[1][0] && d[1][0].T && d[1][0].ID) lastauthor = iauthor.indexOf("tc=" + d[1][0].ID);
-		d[1].forEach(function(c) {
+		else d[1].forEach(function(c) {
 			if(c.a) lastauthor = iauthor.indexOf(escapexml(c.a));
-			if(c.T) ++tcnt;
-			ts.push(c.t == null ? "" : escapexml(c.t));
+			ts.push(c.t||"");
 		});
-		if(tcnt === 0) {
-			d[1].forEach(function(c) {
-				o.push('<comment ref="' + d[0] + '" authorId="' + iauthor.indexOf(escapexml(c.a)) + '"><text>');
-				o.push(writetag("t", c.t == null ? "" : escapexml(c.t)));
-				o.push('</text></comment>');
-			});
-		} else {
-			if(d[1][0] && d[1][0].T && d[1][0].ID) lastauthor = iauthor.indexOf("tc=" + d[1][0].ID);
+		o.push('<comment ref="' + d[0] + '" authorId="' + lastauthor + '"><text>');
+		if(ts.length <= 1) o.push(writetag("t", escapexml(ts[0]||"")));
+		else {
 			/* based on Threaded Comments -> Comments projection */
-			o.push('<comment ref="' + d[0] + '" authorId="' + lastauthor + '"><text>');
 			var t = "Comment:\n    " + (ts[0]) + "\n";
 			for(var i = 1; i < ts.length; ++i) t += "Reply:\n    " + ts[i] + "\n";
 			o.push(writetag("t", escapexml(t)));
-			o.push('</text></comment>');
 		}
+		o.push('</text></comment>');
 	});
 	o.push("</commentList>");
 	if(o.length>2) { o[o.length] = ('</comments>'); o[1]=o[1].replace("/>",">"); }
--- a/bits/58_cmntbin.js
+++ b/bits/58_cmntbin.js
@ -74,10 +74,6 @@ function write_comments_bin(data/*::, opts*/) {
 			if(iauthor.indexOf(c.a) > -1) return;
 			iauthor.push(c.a.slice(0,54));
 			write_record(ba, 0x0278 /* BrtCommentAuthor */, write_BrtCommentAuthor(c.a));
-			if(c.T && c.ID && iauthor.indexOf("tc=" + c.ID) == -1) {
-				iauthor.push("tc=" + c.ID);
-				write_record(ba, 0x0278 /* BrtCommentAuthor */, write_BrtCommentAuthor("tc=" + c.ID));
-			}
 		});
 	});
 	write_record(ba, 0x0277 /* BrtEndCommentAuthors */);
@ -85,11 +81,7 @@ function write_comments_bin(data/*::, opts*/) {
 	write_record(ba, 0x0279 /* BrtBeginCommentList */);
 	data.forEach(function(comment) {
 		comment[1].forEach(function(c) {
-			var _ia = -1;
-			if(c.ID) _ia = iauthor.indexOf("tc=" + c.ID);
-			if(_ia == -1 && comment[1][0].T && comment[1][0].ID) _ia = iauthor.indexOf("tc=" + comment[1][0].ID);
-			if(_ia == -1) _ia = iauthor.indexOf(c.a);
-			c.iauthor = _ia;
+			c.iauthor = iauthor.indexOf(c.a);
 			var range = {s:decode_cell(comment[0]),e:decode_cell(comment[0])};
 			write_record(ba, 0x027B /* BrtBeginComment */, write_BrtBeginComment([range, c]));
 			if(c.t && c.t.length > 0) write_record(ba, 0x027D /* BrtCommentText */, write_BrtCommentText(c));
--- a/bits/61_fcommon.js
+++ b/bits/61_fcommon.js
@ -23,10 +23,7 @@ var rc_to_a1 = /*#__PURE__*/(function(){
 	};
 })();

-var crefregex = /(^|[^._A-Z0-9])(\$?)([A-Z]{1,2}|[A-W][A-Z]{2}|X[A-E][A-Z]|XF[A-D])(\$?)(\d{1,7})(?![_.\(A-Za-z0-9])/g;
-try {
-	crefregex = /(^|[^._A-Z0-9])([$]?)([A-Z]{1,2}|[A-W][A-Z]{2}|X[A-E][A-Z]|XF[A-D])([$]?)(10[0-3]\d{4}|104[0-7]\d{3}|1048[0-4]\d{2}|10485[0-6]\d|104857[0-6]|[1-9]\d{0,5})(?![_.\(A-Za-z0-9])/g;
-}catch(e){}
+var crefregex = /(^|[^._A-Z0-9])([$]?)([A-Z]{1,2}|[A-W][A-Z]{2}|X[A-E][A-Z]|XF[A-D])([$]?)(10[0-3]\d{4}|104[0-7]\d{3}|1048[0-4]\d{2}|10485[0-6]\d|104857[0-6]|[1-9]\d{0,5})(?![_.\(A-Za-z0-9])/g;
 var a1_to_rc = /*#__PURE__*/(function(){
 	return function a1_to_rc(fstr/*:string*/, base/*:CellAddress*/) {
 		return fstr.replace(crefregex, function($0, $1, $2, $3, $4, $5) {
--- a/bits/63_fbin.js
+++ b/bits/63_fbin.js
@ -68,7 +68,8 @@ function write_FormulaValue(value) {
 /* [MS-XLS] 2.4.127 TODO */
 function parse_Formula(blob, length, opts) {
 	var end = blob.l + length;
-	var cell = parse_XLSCell(blob, 6, opts);
+	var cell = parse_XLSCell(blob, 6);
+	if(opts.biff == 2) ++blob.l;
 	var val = parse_FormulaValue(blob,8);
 	var flags = blob.read_shift(1);
 	if(opts.biff != 2) {
@ -262,7 +263,7 @@ function write_XLSBFormulaRangeWS(_str, wb) {
 	var sname = _str.slice(0, lastbang);
 	_str = _str.slice(lastbang+1);
 	if(sname.charAt(0) == "'") sname = sname.slice(1, -1).replace(/''/g, "'");
-	var parts = _str.split(":");
+	var parts = _str.split(":"); str = parts[0];

 	var out = new_buf(27);
 	out.write_shift(4, 19);
--- a/bits/65_fods.js
+++ b/bits/65_fods.js
@ -31,6 +31,6 @@ function ods_to_csf_3D(r/*:string*/)/*:[string, string]*/ {
 }

 function csf_to_ods_3D(r/*:string*/)/*:string*/ {
-	return r.replace(/!/,".").replace(/:/, ":.");
+	return r.replace(/!/,".");
 }

--- a/bits/66_wscommon.js
+++ b/bits/66_wscommon.js
@ -81,7 +81,7 @@ function get_cell_style(styles/*:Array<any>*/, cell/*:Cell*/, opts) {
 	return len;
 }

-function safe_format(p/*:Cell*/, fmtid/*:number*/, fillid/*:?number*/, opts, themes, styles, date1904) {
+function safe_format(p/*:Cell*/, fmtid/*:number*/, fillid/*:?number*/, opts, themes, styles) {
 	try {
 		if(opts.cellNF) p.z = table_fmt[fmtid];
 	} catch(e) { if(opts.WTF) throw e; }
@ -96,14 +96,14 @@ function safe_format(p/*:Cell*/, fmtid/*:number*/, fillid/*:?number*/, opts, the
 				else p.w = SSF_general_num(p.v);
 			}
 			else if(p.t === 'd') {
-				var dd = datenum(p.v, !!date1904);
+				var dd = datenum(p.v);
 				if((dd|0) === dd) p.w = dd.toString(10);
 				else p.w = SSF_general_num(dd);
 			}
 			else if(p.v === undefined) return "";
 			else p.w = SSF_general(p.v,_ssfopts);
 		}
-		else if(p.t === 'd') p.w = SSF_format(fmtid,datenum(p.v, !!date1904),_ssfopts);
+		else if(p.t === 'd') p.w = SSF_format(fmtid,datenum(p.v),_ssfopts);
 		else p.w = SSF_format(fmtid,p.v,_ssfopts);
 	} catch(e) { if(opts.WTF) throw e; }
 	if(!opts.cellStyles) return;
--- a/bits/67_wsxml.js
+++ b/bits/67_wsxml.js
@ -2,7 +2,7 @@ function parse_ws_xml_dim(ws/*:Worksheet*/, s/*:string*/) {
 	var d = safe_decode_range(s);
 	if(d.s.r<=d.e.r && d.s.c<=d.e.c && d.s.r>=0 && d.s.c>=0) ws["!ref"] = encode_range(d);
 }
-var mergecregex = /<(?:\w:)?mergeCell ref=["'][A-Z0-9:]+['"]\s*[\/]?>/g;
+var mergecregex = /<(?:\w:)?mergeCell ref="[A-Z0-9:]+"\s*[\/]?>/g;
 var sheetdataregex = /<(?:\w+:)?sheetData[^>]*>([\s\S]*)<\/(?:\w+:)?sheetData>/;
 var hlinkregex = /<(?:\w:)?hyperlink [^>]*>/mg;
 var dimregex = /"(\w*:\w*)"/;
@ -20,7 +20,7 @@ function parse_ws_xml(data/*:?string*/, opts, idx/*:number*/, rels, wb/*:WBWBPro
 	if(DENSE != null && opts.dense == null) opts.dense = DENSE;

 	/* 18.3.1.99 worksheet CT_Worksheet */
-	var s = ({}/*:any*/); if(opts.dense) s["!data"] = [];
+	var s = opts.dense ? ([]/*:any*/) : ({}/*:any*/);
 	var refguess/*:Range*/ = ({s: {r:2000000, c:2000000}, e: {r:0, c:0} }/*:any*/);

 	var data1 = "", data2 = "";
@ -39,7 +39,7 @@ function parse_ws_xml(data/*:?string*/, opts, idx/*:number*/, rels, wb/*:WBWBPro
 	var ridx = (data1.match(/<(?:\w*:)?dimension/)||{index:-1}).index;
 	if(ridx > 0) {
 		var ref = data1.slice(ridx,ridx+50).match(dimregex);
-		if(ref && !(opts && opts.nodim)) parse_ws_xml_dim(s, ref[1]);
+		if(ref) parse_ws_xml_dim(s, ref[1]);
 	}

 	/* 18.3.1.88 sheetViews CT_SheetViews */
@ -55,7 +55,7 @@ function parse_ws_xml(data/*:?string*/, opts, idx/*:number*/, rels, wb/*:WBWBPro
 	}

 	/* 18.3.1.80 sheetData CT_SheetData ? */
-	if(mtch) parse_ws_xml_data(mtch[1], s, opts, refguess, themes, styles, wb);
+	if(mtch) parse_ws_xml_data(mtch[1], s, opts, refguess, themes, styles);

 	/* 18.3.1.2  autoFilter CT_AutoFilter */
 	var afilter = data2.match(afregex);
@ -75,11 +75,6 @@ function parse_ws_xml(data/*:?string*/, opts, idx/*:number*/, rels, wb/*:WBWBPro
 	var margins = data2.match(marginregex);
 	if(margins) s['!margins'] = parse_ws_xml_margins(parsexmltag(margins[0]));

-	/* legacyDrawing */
-	var m;
-	if((m = data2.match(/legacyDrawing r:id="(.*?)"/))) s['!legrel'] = m[1];
-
-	if(opts && opts.nodim) refguess.s.c = refguess.s.r = 0;
 	if(!s["!ref"] && refguess.e.c >= refguess.s.c && refguess.e.r >= refguess.s.r) s["!ref"] = encode_range(refguess);
 	if(opts.sheetRows > 0 && s["!ref"]) {
 		var tmpref = safe_decode_range(s["!ref"]);
@ -95,7 +90,6 @@ function parse_ws_xml(data/*:?string*/, opts, idx/*:number*/, rels, wb/*:WBWBPro
 	}
 	if(columns.length > 0) s["!cols"] = columns;
 	if(merges.length > 0) s["!merges"] = merges;
-	if(rels['!id'][s['!legrel']]) s['!legdrawel'] = rels['!id'][s['!legrel']];
 	return s;
 }

@ -155,7 +149,7 @@ function write_ws_xml_protection(sp)/*:string*/ {
 }

 function parse_ws_xml_hlinks(s, data/*:Array<string>*/, rels) {
-	var dense = s["!data"] != null;
+	var dense = Array.isArray(s);
 	for(var i = 0; i != data.length; ++i) {
 		var val = parsexmltag(utf8read(data[i]), true);
 		if(!val.ref) return;
@ -171,11 +165,11 @@ function parse_ws_xml_hlinks(s, data/*:Array<string>*/, rels) {
 		if(val.tooltip) { val.Tooltip = val.tooltip; delete val.tooltip; }
 		var rng = safe_decode_range(val.ref);
 		for(var R=rng.s.r;R<=rng.e.r;++R) for(var C=rng.s.c;C<=rng.e.c;++C) {
-			var addr = encode_col(C) + encode_row(R);
+			var addr = encode_cell({c:C,r:R});
 			if(dense) {
-				if(!s["!data"][R]) s["!data"][R] = [];
-				if(!s["!data"][R][C]) s["!data"][R][C] = {t:"z",v:undefined};
-				s["!data"][R][C].l = val;
+				if(!s[R]) s[R] = [];
+				if(!s[R][C]) s[R][C] = {t:"z",v:undefined};
+				s[R][C].l = val;
 			} else {
 				if(!s[addr]) s[addr] = {t:"z",v:undefined};
 				s[addr].l = val;
@ -262,27 +256,21 @@ function write_ws_xml_sheetviews(ws, opts, idx, wb)/*:string*/ {
 	return writextag("sheetViews", writextag("sheetView", null, sview), {});
 }

-function write_ws_xml_cell(cell/*:Cell*/, ref, ws, opts, idx, wb, date1904)/*:string*/ {
+function write_ws_xml_cell(cell/*:Cell*/, ref, ws, opts/*::, idx, wb*/)/*:string*/ {
 	if(cell.c) ws['!comments'].push([ref, cell.c]);
 	if((cell.v === undefined || cell.t === "z" && !(opts||{}).sheetStubs) && typeof cell.f !== "string" && typeof cell.z == "undefined") return "";
 	var vv = "";
 	var oldt = cell.t, oldv = cell.v;
 	if(cell.t !== "z") switch(cell.t) {
 		case 'b': vv = cell.v ? "1" : "0"; break;
-		case 'n':
-			if(isNaN(cell.v)) { cell.t = "e"; vv = BErr[cell.v = 0x24]; } // #NUM!
-			else if(!isFinite(cell.v)) { cell.t = "e"; vv = BErr[cell.v = 0x07]; } // #DIV/0!
-			else vv = ''+cell.v; break;
+		case 'n': vv = ''+cell.v; break;
 		case 'e': vv = BErr[cell.v]; break;
 		case 'd':
-			if(opts && opts.cellDates) {
-				var _vv = parseDate(cell.v, date1904);
-				vv = _vv.toISOString();
-				if(_vv.getUTCFullYear() < 1900) vv = vv.slice(vv.indexOf("T") + 1).replace("Z","");
-			} else {
+			if(opts && opts.cellDates) vv = parseDate(cell.v, -1).toISOString();
+			else {
 				cell = dup(cell);
 				cell.t = 'n';
-				vv = ''+(cell.v = datenum(parseDate(cell.v, date1904), date1904));
+				vv = ''+(cell.v = datenum(parseDate(cell.v)));
 			}
 			if(typeof cell.z === 'undefined') cell.z = table_fmt[14];
 			break;
@ -311,10 +299,7 @@ function write_ws_xml_cell(cell/*:Cell*/, ref, ws, opts, idx, wb, date1904)/*:st
 		var ff = cell.F && cell.F.slice(0, ref.length) == ref ? {t:"array", ref:cell.F} : null;
 		v = writextag('f', escapexml(cell.f), ff) + (cell.v != null ? v : "");
 	}
-	if(cell.l) {
-		cell.l.display = escapexml(vv);
-		ws['!links'].push([ref, cell.l]);
-	}
+	if(cell.l) ws['!links'].push([ref, cell.l]);
 	if(cell.D) o.cm = 1;
 	return writextag('c', v, o);
 }
@ -325,7 +310,7 @@ var parse_ws_xml_data = /*#__PURE__*/(function() {
 	var refregex = /ref=["']([^"']*)["']/;
 	var match_v = matchtag("v"), match_f = matchtag("f");

-return function parse_ws_xml_data(sdata/*:string*/, s, opts, guess/*:Range*/, themes, styles, wb) {
+return function parse_ws_xml_data(sdata/*:string*/, s, opts, guess/*:Range*/, themes, styles) {
 	var ri = 0, x = "", cells/*:Array<string>*/ = [], cref/*:?Array<string>*/ = [], idx=0, i=0, cc=0, d="", p/*:any*/;
 	var tag, tagr = 0, tagc = 0;
 	var sstr, ftag;
@ -333,10 +318,9 @@ return function parse_ws_xml_data(sdata/*:string*/, s, opts, guess/*:Range*/, th
 	var do_format = Array.isArray(styles.CellXf), cf;
 	var arrayf/*:Array<[Range, string]>*/ = [];
 	var sharedf = [];
-	var dense = s["!data"] != null;
+	var dense = Array.isArray(s);
 	var rows/*:Array<RowInfo>*/ = [], rowobj = {}, rowrite = false;
 	var sheetStubs = !!opts.sheetStubs;
-	var date1904 = !!((wb||{}).WBProps||{}).date1904;
 	for(var marr = sdata.split(rowregex), mt = 0, marrlen = marr.length; mt != marrlen; ++mt) {
 		x = marr[mt].trim();
 		var xlen = x.length;
@ -365,10 +349,8 @@ return function parse_ws_xml_data(sdata/*:string*/, s, opts, guess/*:Range*/, th
 		tag = parsexmltag(x.slice(rstarti,ri), true);
 		tagr = tag.r != null ? parseInt(tag.r, 10) : tagr+1; tagc = -1;
 		if(opts.sheetRows && opts.sheetRows < tagr) continue;
-		if(!opts.nodim) {
-			if(guess.s.r > tagr - 1) guess.s.r = tagr - 1;
-			if(guess.e.r < tagr - 1) guess.e.r = tagr - 1;
-		}
+		if(guess.s.r > tagr - 1) guess.s.r = tagr - 1;
+		if(guess.e.r < tagr - 1) guess.e.r = tagr - 1;

 		if(opts && opts.cellStyles) {
 			rowobj = {}; rowrite = false;
@ -404,27 +386,19 @@ return function parse_ws_xml_data(sdata/*:string*/, s, opts, guess/*:Range*/, th

 			if((cref=d.match(match_v))!= null && /*::cref != null && */cref[1] !== '') p.v=unescapexml(cref[1]);
 			if(opts.cellFormula) {
-				if((cref=d.match(match_f))!= null /*:: && cref != null*/) {
-					if(cref[1] == "") {
-						if(/*::cref != null && cref[0] != null && */cref[0].indexOf('t="shared"') > -1) {
-							// TODO: parse formula
-							ftag = parsexmltag(cref[0]);
-							if(sharedf[ftag.si]) p.f = shift_formula_xlsx(sharedf[ftag.si][1], sharedf[ftag.si][2]/*[0].ref*/, tag.r);
-						}
-					} else {
-						/* TODO: match against XLSXFutureFunctions */
-						p.f=unescapexml(utf8read(cref[1]), true);
-						if(!opts.xlfn) p.f = _xlfn(p.f);
-						if(/*::cref != null && cref[0] != null && */cref[0].indexOf('t="array"') > -1) {
-							p.F = (d.match(refregex)||[])[1];
-							if(p.F.indexOf(":") > -1) arrayf.push([safe_decode_range(p.F), p.F]);
-						} else if(/*::cref != null && cref[0] != null && */cref[0].indexOf('t="shared"') > -1) {
-							// TODO: parse formula
-							ftag = parsexmltag(cref[0]);
-							var ___f = unescapexml(utf8read(cref[1]));
-							if(!opts.xlfn) ___f = _xlfn(___f);
-							sharedf[parseInt(ftag.si, 10)] = [ftag, ___f, tag.r];
-						}
+				if((cref=d.match(match_f))!= null && /*::cref != null && */cref[1] !== '') {
+					/* TODO: match against XLSXFutureFunctions */
+					p.f=unescapexml(utf8read(cref[1]), true);
+					if(!opts.xlfn) p.f = _xlfn(p.f);
+					if(/*::cref != null && cref[0] != null && */cref[0].indexOf('t="array"') > -1) {
+						p.F = (d.match(refregex)||[])[1];
+						if(p.F.indexOf(":") > -1) arrayf.push([safe_decode_range(p.F), p.F]);
+					} else if(/*::cref != null && cref[0] != null && */cref[0].indexOf('t="shared"') > -1) {
+						// TODO: parse formula
+						ftag = parsexmltag(cref[0]);
+						var ___f = unescapexml(utf8read(cref[1]));
+						if(!opts.xlfn) ___f = _xlfn(___f);
+						sharedf[parseInt(ftag.si, 10)] = [ftag, ___f, tag.r];
 					}
 				} else if((cref=d.match(/<f[^>]*\/>/))) {
 					ftag = parsexmltag(cref[0]);
@ -481,8 +455,8 @@ return function parse_ws_xml_data(sdata/*:string*/, s, opts, guess/*:Range*/, th
 					break;
 				case 'b': p.v = parsexmlbool(p.v); break;
 				case 'd':
-					if(opts.cellDates) p.v = parseDate(p.v, date1904);
-					else { p.v = datenum(parseDate(p.v, date1904), date1904); p.t = 'n'; }
+					if(opts.cellDates) p.v = parseDate(p.v, 1);
+					else { p.v = datenum(parseDate(p.v, 1)); p.t = 'n'; }
 					break;
 				/* error string in .w, number in .v */
 				case 'e':
@ -501,22 +475,16 @@ return function parse_ws_xml_data(sdata/*:string*/, s, opts, guess/*:Range*/, th
 					}
 				}
 			}
-			safe_format(p, fmtid, fillid, opts, themes, styles, date1904);
-			if(opts.cellDates && do_format && p.t == 'n' && fmt_is_date(table_fmt[fmtid])) { p.v = numdate(p.v + (date1904 ? 1462 : 0)); p.t = typeof p.v == "number" ? 'n' : 'd'; }
+			safe_format(p, fmtid, fillid, opts, themes, styles);
+			if(opts.cellDates && do_format && p.t == 'n' && fmt_is_date(table_fmt[fmtid])) { p.t = 'd'; p.v = numdate(p.v); }
 			if(tag.cm && opts.xlmeta) {
 				var cm = (opts.xlmeta.Cell||[])[+tag.cm-1];
 				if(cm && cm.type == 'XLDAPR') p.D = true;
 			}
-			var _r;
-			if(opts.nodim) {
-				_r = decode_cell(tag.r);
-				if(guess.s.r > _r.r) guess.s.r = _r.r;
-				if(guess.e.r < _r.r) guess.e.r = _r.r;
-			}
 			if(dense) {
-				_r = decode_cell(tag.r);
-				if(!s["!data"][_r.r]) s["!data"][_r.r] = [];
-				s["!data"][_r.r][_r.c] = p;
+				var _r = decode_cell(tag.r);
+				if(!s[_r.r]) s[_r.r] = [];
+				s[_r.r][_r.c] = p;
 			} else s[tag.r] = p;
 		}
 	}
@ -525,18 +493,17 @@ return function parse_ws_xml_data(sdata/*:string*/, s, opts, guess/*:Range*/, th

 function write_ws_xml_data(ws/*:Worksheet*/, opts, idx/*:number*/, wb/*:Workbook*//*::, rels*/)/*:string*/ {
 	var o/*:Array<string>*/ = [], r/*:Array<string>*/ = [], range = safe_decode_range(ws['!ref']), cell="", ref, rr = "", cols/*:Array<string>*/ = [], R=0, C=0, rows = ws['!rows'];
-	var dense = ws["!data"] != null;
+	var dense = Array.isArray(ws);
 	var params = ({r:rr}/*:any*/), row/*:RowInfo*/, height = -1;
-	var date1904 = (((wb||{}).Workbook||{}).WBProps||{}).date1904;
 	for(C = range.s.c; C <= range.e.c; ++C) cols[C] = encode_col(C);
 	for(R = range.s.r; R <= range.e.r; ++R) {
 		r = [];
 		rr = encode_row(R);
 		for(C = range.s.c; C <= range.e.c; ++C) {
 			ref = cols[C] + rr;
-			var _cell = dense ? (ws["!data"][R]||[])[C]: ws[ref];
+			var _cell = dense ? (ws[R]||[])[C]: ws[ref];
 			if(_cell === undefined) continue;
-			if((cell = write_ws_xml_cell(_cell, ref, ws, opts, idx, wb, date1904)) != null) r.push(cell);
+			if((cell = write_ws_xml_cell(_cell, ref, ws, opts, idx, wb)) != null) r.push(cell);
 		}
 		if(r.length > 0 || (rows && rows[R])) {
 			params = ({r:rr}/*:any*/);
@ -642,7 +609,6 @@ function write_ws_xml(idx/*:number*/, opts, wb/*:Workbook*/, rels)/*:string*/ {
 			}
 			if((relc = l[1].Target.indexOf("#")) > -1) rel.location = escapexml(l[1].Target.slice(relc+1));
 			if(l[1].Tooltip) rel.tooltip = escapexml(l[1].Tooltip);
-			rel.display = l[1].display;
 			o[o.length] = writextag("hyperlink",null,rel);
 		});
 		o[o.length] = "</hyperlinks>";
--- a/bits/68_wsbin.js
+++ b/bits/68_wsbin.js
@ -41,13 +41,12 @@ function write_BrtRowHdr(R/*:number*/, range, ws) {
 	o.l += 4;

 	var caddr = {r:R, c:0};
-	var dense = ws["!data"] != null;
 	for(var i = 0; i < 16; ++i) {
 		if((range.s.c > ((i+1) << 10)) || (range.e.c < (i << 10))) continue;
 		var first = -1, last = -1;
 		for(var j = (i<<10); j < ((i+1)<<10); ++j) {
 			caddr.c = j;
-			var cell = dense ? (ws["!data"][caddr.r]||[])[caddr.c] : ws[encode_cell(caddr)];
+			var cell = Array.isArray(ws) ? (ws[caddr.r]||[])[caddr.c] : ws[encode_cell(caddr)];
 			if(cell) { if(first < 0) first = j; last = j; }
 		}
 		if(first < 0) continue;
@ -259,10 +258,9 @@ function parse_BrtCellSt(data) {
 	return [cell, value, 'str'];
 }
 function write_BrtCellSt(cell, ncell, o) {
-	var data = cell.v == null ? "" : String(cell.v);
 	if(o == null) o = new_buf(12 + 4 * cell.v.length);
 	write_XLSBCell(ncell, o);
-	write_XLWideString(data, o);
+	write_XLWideString(cell.v, o);
 	return o.length > o.l ? o.slice(0, o.l) : o;
 }
 function parse_BrtShortSt(data) {
@ -271,10 +269,9 @@ function parse_BrtShortSt(data) {
 	return [cell, value, 'str'];
 }
 function write_BrtShortSt(cell, ncell, o) {
-	var data = cell.v == null ? "" : String(cell.v);
-	if(o == null) o = new_buf(8 + 4 * data.length);
+	if(o == null) o = new_buf(8 + 4 * cell.v.length);
 	write_XLSBShortCell(ncell, o);
-	write_XLWideString(data, o);
+	write_XLWideString(cell.v, o);
 	return o.length > o.l ? o.slice(0, o.l) : o;
 }

@ -511,7 +508,7 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 	var opts = _opts || {};
 	if(!rels) rels = {'!id':{}};
 	if(DENSE != null && opts.dense == null) opts.dense = DENSE;
-	var s/*:Worksheet*/ = ({}); if(opts.dense) s["!data"] = [];
+	var s/*:Worksheet*/ = (opts.dense ? [] : {});

 	var ref;
 	var refguess = {s: {r:2000000, c:2000000}, e: {r:0, c:0} };
@ -542,7 +539,6 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 	XLSBRecordEnum[0x0010] = { n:"BrtShortReal", f:parse_BrtShortReal };

 	var cm, vm;
-	var date1904 = 1462 * +!!((wb||{}).WBProps||{}).date1904;

 	recordhopper(data, function ws_parse(val, RR, RT) {
 		if(end) return;
@ -586,9 +582,9 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 					case 'str': p.t = 's'; p.v = val[1]; break;
 					case 'is': p.t = 's'; p.v = val[1].t; break;
 				}
-				if((cf = styles.CellXf[val[0].iStyleRef])) safe_format(p,cf.numFmtId,null,opts, themes, styles, date1904>0);
+				if((cf = styles.CellXf[val[0].iStyleRef])) safe_format(p,cf.numFmtId,null,opts, themes, styles);
 				C = val[0].c == -1 ? C + 1 : val[0].c;
-				if(opts.dense) { if(!s["!data"][R]) s["!data"][R] = []; s["!data"][R][C] = p; }
+				if(opts.dense) { if(!s[R]) s[R] = []; s[R][C] = p; }
 				else s[encode_col(C) + rr] = p;
 				if(opts.cellFormula) {
 					af = false;
@ -607,7 +603,7 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 				if(refguess.e.r < row.r) refguess.e.r = row.r;
 				if(refguess.e.c < C) refguess.e.c = C;
 				if(opts.cellDates && cf && p.t == 'n' && fmt_is_date(table_fmt[cf.numFmtId])) {
-					var _d = SSF_parse_date_code(p.v + date1904); if(_d) { p.t = 'd'; p.v = new Date(Date.UTC(_d.y, _d.m-1,_d.d,_d.H,_d.M,_d.S,_d.u)); }
+					var _d = SSF_parse_date_code(p.v); if(_d) { p.t = 'd'; p.v = new Date(_d.y, _d.m-1,_d.d,_d.H,_d.M,_d.S,_d.u); }
 				}
 				if(cm) {
 					if(cm.type == 'XLDAPR') p.D = true;
@ -621,7 +617,7 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 				if(!opts.sheetStubs || pass) break;
 				p = ({t:'z',v:void 0}/*:any*/);
 				C = val[0].c == -1 ? C + 1 : val[0].c;
-				if(opts.dense) { if(!s["!data"][R]) s["!data"][R] = []; s["!data"][R][C] = p; }
+				if(opts.dense) { if(!s[R]) s[R] = []; s[R][C] = p; }
 				else s[encode_col(C) + rr] = p;
 				if(refguess.s.r > row.r) refguess.s.r = row.r;
 				if(refguess.s.c > C) refguess.s.c = C;
@ -652,11 +648,11 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 				}
 				for(R=val.rfx.s.r;R<=val.rfx.e.r;++R) for(C=val.rfx.s.c;C<=val.rfx.e.c;++C) {
 					if(opts.dense) {
-						if(!s["!data"][R]) s["!data"][R] = [];
-						if(!s["!data"][R][C]) s["!data"][R][C] = {t:'z',v:undefined};
-						s["!data"][R][C].l = val;
+						if(!s[R]) s[R] = [];
+						if(!s[R][C]) s[R][C] = {t:'z',v:undefined};
+						s[R][C].l = val;
 					} else {
-						addr = encode_col(C) + encode_row(R);
+						addr = encode_cell({c:C,r:R});
 						if(!s[addr]) s[addr] = {t:'z',v:undefined};
 						s[addr].l = val;
 					}
@ -666,14 +662,14 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 			case 0x01AA: /* 'BrtArrFmla' */
 				if(!opts.cellFormula) break;
 				arrayf.push(val);
-				cell = ((opts.dense ? s["!data"][R][C] : s[encode_col(C) + rr])/*:any*/);
+				cell = ((opts.dense ? s[R][C] : s[encode_col(C) + rr])/*:any*/);
 				cell.f = stringify_formula(val[1], refguess, {r:row.r, c:C}, supbooks, opts);
 				cell.F = encode_range(val[0]);
 				break;
 			case 0x01AB: /* 'BrtShrFmla' */
 				if(!opts.cellFormula) break;
 				sharedf[encode_cell(val[0].s)] = val[1];
-				cell = (opts.dense ? s["!data"][R][C] : s[encode_col(C) + rr]);
+				cell = (opts.dense ? s[R][C] : s[encode_col(C) + rr]);
 				cell.f = stringify_formula(val[1], refguess, {r:row.r, c:C}, supbooks, opts);
 				break;

@ -687,10 +683,6 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 				}
 				break;

-			case 0x0227: /* 'BrtLegacyDrawing' */
-				if(val) s["!legrel"] = val;
-				break;
-
 			case 0x00A1: /* 'BrtBeginAFilter' */
 				s['!autofilter'] = { ref:encode_range(val) };
 				break;
@ -747,6 +739,7 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 			case 0x0499: /* 'BrtFilter14' */
 			case 0x00A9: /* 'BrtIconFilter' */
 			case 0x049D: /* 'BrtIconFilter14' */
+			case 0x0227: /* 'BrtLegacyDrawing' */
 			case 0x0228: /* 'BrtLegacyDrawingHF' */
 			case 0x0295: /* 'BrtListPart' */
 			case 0x027F: /* 'BrtOleObject' */
@ -805,12 +798,11 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 	if(merges.length > 0) s["!merges"] = merges;
 	if(colinfo.length > 0) s["!cols"] = colinfo;
 	if(rowinfo.length > 0) s["!rows"] = rowinfo;
-	if(rels['!id'][s['!legrel']]) s['!legdrawel'] = rels['!id'][s['!legrel']];
 	return s;
 }

 /* TODO: something useful -- this is a stub */
-function write_ws_bin_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:number*/, opts, ws/*:Worksheet*/, last_seen/*:boolean*/, date1904/*:boolean*/)/*:boolean*/ {
+function write_ws_bin_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:number*/, opts, ws/*:Worksheet*/, last_seen/*:boolean*/)/*:boolean*/ {
 	var o/*:any*/ = ({r:R, c:C}/*:any*/);
 	if(cell.c) ws['!comments'].push([encode_cell(o), cell.c]);
 	if(cell.v === undefined) return false;
@ -820,7 +812,7 @@ function write_ws_bin_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:num
 		case 'd': // no BrtCellDate :(
 			cell = dup(cell);
 			cell.z = cell.z || table_fmt[14];
-			cell.v = datenum(parseDate(cell.v, date1904), date1904); cell.t = 'n';
+			cell.v = datenum(parseDate(cell.v)); cell.t = 'n';
 			break;
 		/* falls through */
 		case 'n': case 'e': vv = ''+cell.v; break;
@ -832,7 +824,7 @@ function write_ws_bin_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:num
 	switch(cell.t) {
 		case 's': case 'str':
 			if(opts.bookSST) {
-				vv = get_sst_id(opts.Strings, (cell.v == null ? "" : String(cell.v)/*:any*/), opts.revStrings);
+				vv = get_sst_id(opts.Strings, (cell.v/*:any*/), opts.revStrings);
 				o.t = "s"; o.v = vv;
 				if(last_seen) write_record(ba, 0x0012 /* BrtShortIsst */, write_BrtShortIsst(cell, o));
 				else write_record(ba, 0x0007 /* BrtCellIsst */, write_BrtCellIsst(cell, o));
@ -847,12 +839,6 @@ function write_ws_bin_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:num
 			if(cell.v == (cell.v | 0) && cell.v > -1000 && cell.v < 1000) {
 				if(last_seen) write_record(ba, 0x000D /* BrtShortRk */, write_BrtShortRk(cell, o));
 				else write_record(ba, 0x0002 /* BrtCellRk */, write_BrtCellRk(cell, o));
-			} else if(isNaN(cell.v)) {
-				if(last_seen) write_record(ba, 0x000E /* BrtShortError */, write_BrtShortError({t:"e", v: 0x24}, o)); // #NUM!
-				else write_record(ba, 0x0003 /* BrtCellError */, write_BrtCellError({t:"e", v: 0x24}, o)); // #NUM!
-			} else if(!isFinite(cell.v)) {
-				if(last_seen) write_record(ba, 0x000E /* BrtShortError */, write_BrtShortError({t:"e", v: 0x07}, o)); // #DIV/0!
-				else write_record(ba, 0x0003 /* BrtCellError */, write_BrtCellError({t:"e", v: 0x07}, o)); // #DIV/0!
 			} else {
 				if(last_seen) write_record(ba, 0x0010 /* BrtShortReal */, write_BrtShortReal(cell, o));
 				else write_record(ba, 0x0005 /* BrtCellReal */, write_BrtCellReal(cell, o));
@ -873,11 +859,10 @@ function write_ws_bin_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:num
 	return true;
 }

-function write_CELLTABLE(ba, ws/*:Worksheet*/, idx/*:number*/, opts, wb/*:Workbook*/) {
+function write_CELLTABLE(ba, ws/*:Worksheet*/, idx/*:number*/, opts/*::, wb:Workbook*/) {
 	var range = safe_decode_range(ws['!ref'] || "A1"), ref, rr = "", cols/*:Array<string>*/ = [];
-	var date1904 = (((wb||{}).Workbook||{}).WBProps||{}).date1904;
 	write_record(ba, 0x0091 /* BrtBeginSheetData */);
-	var dense = ws["!data"] != null;
+	var dense = Array.isArray(ws);
 	var cap = range.e.r;
 	if(ws['!rows']) cap = Math.max(range.e.r, ws['!rows'].length - 1);
 	for(var R = range.s.r; R <= cap; ++R) {
@ -890,10 +875,10 @@ function write_CELLTABLE(ba, ws/*:Worksheet*/, idx/*:number*/, opts, wb/*:Workbo
 			/* *16384CELL */
 			if(R === range.s.r) cols[C] = encode_col(C);
 			ref = cols[C] + rr;
-			var cell = dense ? (ws["!data"][R]||[])[C] : ws[ref];
+			var cell = dense ? (ws[R]||[])[C] : ws[ref];
 			if(!cell) { last_seen = false; continue; }
 			/* write cell */
-			last_seen = write_ws_bin_cell(ba, cell, R, C, opts, ws, last_seen, date1904);
+			last_seen = write_ws_bin_cell(ba, cell, R, C, opts, ws, last_seen);
 		}
 	}
 	write_record(ba, 0x0092 /* BrtEndSheetData */);
--- a/bits/69_chartxml.js
+++ b/bits/69_chartxml.js
@ -34,10 +34,7 @@ function parse_chart(data/*:?string*/, name/*:string*/, opts, rels, wb, csheet)
 		refguess.e.c = C;
 		col = encode_col(C);
 		cache[0].forEach(function(n,i) {
-			if(cs["!data"]) {
-				if(!cs["!data"][i]) cs["!data"][i] = [];
-				cs["!data"][i][C] = {t:'n', v:n, z:cache[1] };
-			} else cs[col + encode_row(i)] = {t:'n', v:n, z:cache[1] };
+			cs[col + encode_row(i)] = {t:'n', v:n, z:cache[1] };
 			R = i;
 		});
 		if(refguess.e.r < R) refguess.e.r = R;
--- a/bits/71_wbcommon.js
+++ b/bits/71_wbcommon.js
@ -115,17 +115,14 @@ function safe1904(wb/*:Workbook*/)/*:string*/ {

 var badchars = /*#__PURE__*/":][*?\/\\".split("");
 function check_ws_name(n/*:string*/, safe/*:?boolean*/)/*:boolean*/ {
-	try {
-		if(n == "") throw new Error("Sheet name cannot be blank");
-		if(n.length > 31) throw new Error("Sheet name cannot exceed 31 chars");
-		if(n.charCodeAt(0) == 0x27 || n.charCodeAt(n.length - 1) == 0x27) throw new Error("Sheet name cannot start or end with apostrophe (')");
-		if(n.toLowerCase() == "history") throw new Error("Sheet name cannot be 'History'");
-		badchars.forEach(function(c) {
-			if(n.indexOf(c) == -1) return;
-			throw new Error("Sheet name cannot contain : \\ / ? * [ ]");
-		});
-	} catch(e) { if(safe) return false; throw e; }
-	return true;
+	if(n.length > 31) { if(safe) return false; throw new Error("Sheet names cannot exceed 31 chars"); }
+	var _good = true;
+	badchars.forEach(function(c) {
+		if(n.indexOf(c) == -1) return;
+		if(!safe) throw new Error("Sheet name cannot contain : \\ / ? * [ ]");
+		_good = false;
+	});
+	return _good;
 }
 function check_wb_names(N, S, codes) {
 	N.forEach(function(n,i) {
--- a/bits/75_xlml.js
+++ b/bits/75_xlml.js
@ -40,10 +40,10 @@ function xlml_parsexmltagobj(tag/*:string*/) {
 /* map from xlml named formats to SSF TODO: localize */
 var XLMLFormatMap/*: {[string]:string}*/;

-function xlml_format(format, value, date1904)/*:string*/ {
+function xlml_format(format, value)/*:string*/ {
 	var fmt = XLMLFormatMap[format] || unescapexml(format);
 	if(fmt === "General") return SSF_general(value);
-	return SSF_format(fmt, value, {date1904: !!date1904});
+	return SSF_format(fmt, value);
 }

 function xlml_set_custprop(Custprops, key, cp, val/*:string*/) {
@ -59,7 +59,7 @@ function xlml_set_custprop(Custprops, key, cp, val/*:string*/) {
 	Custprops[unescapexml(key)] = oval;
 }

-function safe_format_xlml(cell/*:Cell*/, nf, o, date1904) {
+function safe_format_xlml(cell/*:Cell*/, nf, o) {
 	if(cell.t === 'z') return;
 	if(!o || o.cellText !== false) try {
 		if(cell.t === 'e') { cell.w = cell.w || BErr[cell.v]; }
@ -70,13 +70,13 @@ function safe_format_xlml(cell/*:Cell*/, nf, o, date1904) {
 			}
 			else cell.w = SSF_general(cell.v);
 		}
-		else cell.w = xlml_format(nf||"General", cell.v, date1904);
+		else cell.w = xlml_format(nf||"General", cell.v);
 	} catch(e) { if(o.WTF) throw e; }
 	try {
 		var z = XLMLFormatMap[nf]||nf||"General";
 		if(o.cellNF) cell.z = z;
 		if(o.cellDates && cell.t == 'n' && fmt_is_date(z)) {
-			var _d = SSF_parse_date_code(cell.v + (date1904 ? 1462 : 0)); if(_d) { cell.t = 'd'; cell.v = new Date(Date.UTC(_d.y, _d.m-1,_d.d,_d.H,_d.M,_d.S,_d.u)); }
+			var _d = SSF_parse_date_code(cell.v); if(_d) { cell.t = 'd'; cell.v = new Date(_d.y, _d.m-1,_d.d,_d.H,_d.M,_d.S,_d.u); }
 		}
 	} catch(e) { if(o.WTF) throw e; }
 }
@ -92,7 +92,7 @@ function process_style_xlml(styles, stag, opts) {
 }

 /* TODO: there must exist some form of OSP-blessed spec */
-function parse_xlml_data(xml, ss, data, cell/*:any*/, base, styles, csty, row, arrayf, o, date1904) {
+function parse_xlml_data(xml, ss, data, cell/*:any*/, base, styles, csty, row, arrayf, o) {
 	var nf = "General", sid = cell.StyleID, S = {}; o = o || {};
 	var interiors = [];
 	var i = 0;
@ -115,8 +115,9 @@ function parse_xlml_data(xml, ss, data, cell/*:any*/, base, styles, csty, row, a
 			break;
 		case 'DateTime':
 			if(xml.slice(-1) != "Z") xml += "Z";
-			cell.v = datenum(parseDate(xml, date1904), date1904);
+			cell.v = (parseDate(xml) - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
 			if(cell.v !== cell.v) cell.v = unescapexml(xml);
+			else if(cell.v<60) cell.v = cell.v -1;
 			if(!nf || nf == "General") nf = "yyyy-mm-dd";
 			/* falls through */
 		case 'Number':
@ -129,7 +130,7 @@ function parse_xlml_data(xml, ss, data, cell/*:any*/, base, styles, csty, row, a
 			else { cell.t = 's'; cell.v = xlml_fixstr(ss||xml); }
 			break;
 	}
-	safe_format_xlml(cell, nf, o, date1904);
+	safe_format_xlml(cell, nf, o);
 	if(o.cellFormula !== false) {
 		if(cell.Formula) {
 			var fstr = unescapexml(cell.Formula);
@ -206,7 +207,7 @@ function parse_xlml_xml(d, _opts)/*:Workbook*/ {
 	var Rn;
 	var state = [], tmp;
 	if(DENSE != null && opts.dense == null) opts.dense = DENSE;
-	var sheets = {}, sheetnames/*:Array<string>*/ = [], cursheet/*:Worksheet*/ = ({}), sheetname = ""; if(opts.dense) cursheet["!data"] = [];
+	var sheets = {}, sheetnames/*:Array<string>*/ = [], cursheet/*:Worksheet*/ = (opts.dense ? [] : {}), sheetname = "";
 	var cell = ({}/*:any*/), row = {};// eslint-disable-line no-unused-vars
 	var dtag = xlml_parsexmltag('<Data ss:Type="String">'), didx = 0;
 	var c = 0, r = 0;
@ -231,7 +232,7 @@ function parse_xlml_xml(d, _opts)/*:Workbook*/ {
 				break;
 			}
 			if(state[state.length-1][1]) break;
-			if(Rn[1]==='/') parse_xlml_data(str.slice(didx, Rn.index), ss, dtag, state[state.length-1][0]==/*"Comment"*/"comment"?comment:cell, {c:c,r:r}, styles, cstys[c], row, arrayf, opts, Workbook.WBProps.date1904);
+			if(Rn[1]==='/') parse_xlml_data(str.slice(didx, Rn.index), ss, dtag, state[state.length-1][0]==/*"Comment"*/"comment"?comment:cell, {c:c,r:r}, styles, cstys[c], row, arrayf, opts);
 			else { ss = ""; dtag = xlml_parsexmltag(Rn[0]); didx = Rn.index + Rn[0].length; }
 			break;
 		case 'cell' /*case 'Cell'*/:
@ -239,8 +240,8 @@ function parse_xlml_xml(d, _opts)/*:Workbook*/ {
 				if(comments.length > 0) cell.c = comments;
 				if((!opts.sheetRows || opts.sheetRows > r) && cell.v !== void 0) {
 					if(opts.dense) {
-						if(!cursheet["!data"][r]) cursheet["!data"][r] = [];
-						cursheet["!data"][r][c] = cell;
+						if(!cursheet[r]) cursheet[r] = [];
+						cursheet[r][c] = cell;
 					} else cursheet[encode_col(c) + encode_row(r)] = cell;
 				}
 				if(cell.HRef) {
@ -260,8 +261,8 @@ function parse_xlml_xml(d, _opts)/*:Workbook*/ {
 						for(var cmd = r; cmd <= rr; ++cmd) {
 							if(cma > c || cmd > r) {
 								if(opts.dense) {
-									if(!cursheet["!data"][cmd]) cursheet["!data"][cmd] = [];
-									cursheet["!data"][cmd][cma] = {t:'z'};
+									if(!cursheet[cmd]) cursheet[cmd] = [];
+									cursheet[cmd][cma] = {t:'z'};
 								} else cursheet[encode_col(cma) + encode_row(cmd)] = {t:'z'};
 							}
 						}
@ -320,7 +321,7 @@ function parse_xlml_xml(d, _opts)/*:Workbook*/ {
 				state.push([Rn[3], false]);
 				tmp = xlml_parsexmltag(Rn[0]);
 				sheetname = unescapexml(tmp.Name);
-				cursheet = ({}); if(opts.dense) cursheet["!data"] = [];
+				cursheet = (opts.dense ? [] : {});
 				merges = [];
 				arrayf = [];
 				rowinfo = [];
@ -442,7 +443,6 @@ function parse_xlml_xml(d, _opts)/*:Workbook*/ {
 			} else {
 				state.push([Rn[3], false]);
 				tmp = xlml_parsexmltag(Rn[0]);
-				if(!parsexmlbool(tmp["ShowAlways"]||"0")) comments.hidden = true;
 				comment = ({a:tmp.Author}/*:any*/);
 			}
 			break;
@ -534,9 +534,6 @@ function parse_xlml_xml(d, _opts)/*:Workbook*/ {
 						/*:: if(!Workbook.WBProps) Workbook.WBProps = {}; */
 						Workbook.WBProps.date1904 = true;
 						break;
-					case 'hidehorizontalscrollbar' /*case 'HideHorizontalScrollBar'*/: break;
-					case 'hideverticalscrollbar' /*case 'HideVerticalScrollBar'*/: break;
-					case 'hideworkbooktabs' /*case 'HideWorkbookTabs'*/: break;
 					case 'windowheight' /*case 'WindowHeight'*/: break;
 					case 'windowwidth' /*case 'WindowWidth'*/: break;
 					case 'windowtopx' /*case 'WindowTopX'*/: break;
@ -1105,15 +1102,11 @@ function write_ws_xlml_wsopts(ws/*:Worksheet*/, opts, idx/*:number*/, wb/*:Workb
 	return writextag("WorksheetOptions", o.join(""), {xmlns:XLMLNS.x});
 }
 function write_ws_xlml_comment(comments/*:Array<any>*/)/*:string*/ {
-	/* TODO: test multiple comments */
 	return comments.map(function(c) {
 		// TODO: formatted text
 		var t = xlml_unfixstr(c.t||"");
 		var d =writextag("ss:Data", t, {"xmlns":"http://www.w3.org/TR/REC-html40"});
-		var p = {};
-		if(c.a) p["ss:Author"] = c.a;
-		if(!comments.hidden) p["ss:ShowAlways"] = "1";
-		return writextag("Comment", d, p);
+		return writextag("Comment", d, {"ss:Author":c.a});
 	}).join("");
 }
 function write_ws_xlml_cell(cell, ref/*:string*/, ws, opts, idx/*:number*/, wb, addr)/*:string*/{
@ -1184,7 +1177,7 @@ function write_ws_xlml_table(ws/*:Worksheet*/, opts, idx/*:number*/, wb/*:Workbo
 		if(n.hidden) k['ss:Hidden']="1";
 		o.push(writextag("Column",null,k));
 	});
-	var dense = ws["!data"] != null;
+	var dense = Array.isArray(ws);
 	for(var R = range.s.r; R <= range.e.r; ++R) {
 		var row = [write_ws_xlml_row(R, (ws['!rows']||[])[R])];
 		for(var C = range.s.c; C <= range.e.c; ++C) {
@ -1199,7 +1192,7 @@ function write_ws_xlml_table(ws/*:Worksheet*/, opts, idx/*:number*/, wb/*:Workbo
 			}
 			if(skip) continue;
 			var addr = {r:R,c:C};
-			var ref = encode_col(C) + encode_row(R), cell = dense ? (ws["!data"][R]||[])[C] : ws[ref];
+			var ref = encode_cell(addr), cell = dense ? (ws[R]||[])[C] : ws[ref];
 			row.push(write_ws_xlml_cell(cell, ref, ws, opts, idx, wb, addr));
 		}
 		row.push("</Row>");
--- a/bits/76_xls.js
+++ b/bits/76_xls.js
@ -77,7 +77,7 @@ function safe_format_xf(p/*:any*/, opts/*:ParseOpts*/, date1904/*:?boolean*/) {
 	var fmtid = 0;
 	try {
 		fmtid = p.z || p.XF.numFmtId || 0;
-		if(opts.cellNF && p.z == null) p.z = table_fmt[fmtid];
+		if(opts.cellNF) p.z = table_fmt[fmtid];
 	} catch(e) { if(opts.WTF) throw e; }
 	if(!opts || opts.cellText !== false) try {
 		if(p.t === 'e') { p.w = p.w || BErr[p.v]; }
@ -91,7 +91,7 @@ function safe_format_xf(p/*:any*/, opts/*:ParseOpts*/, date1904/*:?boolean*/) {
 		else p.w = SSF_format(fmtid,p.v, {date1904:!!date1904, dateNF: opts && opts.dateNF});
 	} catch(e) { if(opts.WTF) throw e; }
 	if(opts.cellDates && fmtid && p.t == 'n' && fmt_is_date(table_fmt[fmtid] || String(fmtid))) {
-		var _d = SSF_parse_date_code(p.v + (date1904 ? 1462 : 0)); if(_d) { p.t = 'd'; p.v = new Date(Date.UTC(_d.y, _d.m-1,_d.d,_d.H,_d.M,_d.S,_d.u)); }
+		var _d = SSF_parse_date_code(p.v); if(_d) { p.t = 'd'; p.v = new Date(_d.y, _d.m-1,_d.d,_d.H,_d.M,_d.S,_d.u); }
 	}
 }

@ -104,7 +104,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 	var wb = ({opts:{}}/*:any*/);
 	var Sheets = {};
 	if(DENSE != null && options.dense == null) options.dense = DENSE;
-	var out/*:Worksheet*/ = ({}/*:any*/); if(options.dense) out["!data"] = [];
+	var out/*:Worksheet*/ = ((options.dense ? [] : {})/*:any*/);
 	var Directory = {};
 	var range/*:Range*/ = ({}/*:any*/);
 	var last_formula = null;
@ -119,7 +119,6 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 	var XFs = []; /* XF records */
 	var palette/*:Array<[number, number, number]>*/ = [];
 	var Workbook/*:WBWBProps*/ = ({ Sheets:[], WBProps:{date1904:false}, Views:[{}] }/*:any*/), wsprops = {};
-	var biff4w = false;
 	var get_rgb = function getrgb(icv/*:number*/)/*:[number, number, number]*/ {
 		if(icv < 8) return XLSIcv[icv];
 		if(icv < 64) return palette[icv-8] || XLSIcv[icv];
@ -135,7 +134,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 		if((t = rgb2Hex(get_rgb(xfd.icvBack)))) { line.s.bgColor = {rgb:t}; }
 	};
 	var addcell = function addcell(cell/*:any*/, line/*:any*/, options/*:any*/) {
-		if(!biff4w && file_depth > 1) return;
+		if(file_depth > 1) return;
 		if(options.sheetRows && cell.r >= options.sheetRows) return;
 		if(options.cellStyles && line.XF && line.XF.data) process_cell_style(cell, line, options);
 		delete line.ixfe; delete line.XF;
@ -158,8 +157,8 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 		}
 		{
 			if(options.dense) {
-				if(!out["!data"][cell.r]) out["!data"][cell.r] = [];
-				out["!data"][cell.r][cell.c] = line;
+				if(!out[cell.r]) out[cell.r] = [];
+				out[cell.r][cell.c] = line;
 			} else out[last_cell] = line;
 		}
 	};
@ -266,7 +265,6 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 					if(!val.fBelow) (out["!outline"] || (out["!outline"] = {})).above = true;
 					if(!val.fRight) (out["!outline"] || (out["!outline"] = {})).left = true;
 					break; // TODO
-				case 0x0043: /* BIFF2XF */ case 0x0243: /* BIFF3XF */ case 0x0443: /* BIFF4XF */
 				case 0x00e0 /* XF */:
 					XFs.push(val); break;
 				case 0x01ae /* SupBook */:
@ -301,11 +299,11 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 				case 0x0012 /* Protect */: out["!protect"] = val; break; /* for sheet or book */
 				case 0x0013 /* Password */: if(val !== 0 && opts.WTF) console.error("Password verifier: " + val); break;
 				case 0x0085 /* BoundSheet8 */: {
-					Directory[opts.biff == 4 ? opts.snames.length : val.pos] = val;
+					Directory[val.pos] = val;
 					opts.snames.push(val.name);
 				} break;
 				case 0x000a /* EOF */: {
-					if(--file_depth ? !biff4w : biff4w) break;
+					if(--file_depth) break;
 					if(range.e) {
 						if(range.e.r > 0 && range.e.c > 0) {
 							range.e.r--; range.e.c--;
@ -326,7 +324,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 						Workbook.Sheets.push(wsprops);
 					}
 					if(cur_sheet === "") Preamble = out; else Sheets[cur_sheet] = out;
-					out = ({}/*:any*/); if(options.dense) out["!data"] = [];
+					out = ((options.dense ? [] : {})/*:any*/);
 				} break;
 				case 0x0009: case 0x0209: case 0x0409: case 0x0809 /* BOF */: {
 					if(opts.biff === 8) opts.biff = {
@ -344,15 +342,13 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 					}[val.BIFFVer] || 8;
 					opts.biffguess = val.BIFFVer == 0;
 					if(val.BIFFVer == 0 && val.dt == 0x1000) { opts.biff = 5; seen_codepage = true; set_cp(opts.codepage = 28591); }
-					if(opts.biff == 4 && val.dt & 0x100) biff4w = true;
 					if(opts.biff == 8 && val.BIFFVer == 0 && val.dt == 16) opts.biff = 2;
-					if(file_depth++ && !biff4w) break;
-					out = ({}/*:any*/); if(options.dense) out["!data"] = [];
+					if(file_depth++) break;
+					out = ((options.dense ? [] : {})/*:any*/);

 					if(opts.biff < 8 && !seen_codepage) { seen_codepage = true; set_cp(opts.codepage = options.codepage || 1252); }
-					if(opts.biff == 4 && biff4w) {
-						cur_sheet = (Directory[opts.snames.indexOf(cur_sheet)+1] || {name:""}).name;
-					} else if(opts.biff < 5 || val.BIFFVer == 0 && val.dt == 0x1000) {
+
+					if(opts.biff < 5 || val.BIFFVer == 0 && val.dt == 0x1000) {
 						if(cur_sheet === "") cur_sheet = "Sheet1";
 						range = {s:{r:0,c:0},e:{r:0,c:0}};
 						/* fake BoundSheet8 */
@ -371,21 +367,21 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 					wsprops = {Hidden:(Directory[s]||{hs:0}).hs, name:cur_sheet };
 				} break;
 				case 0x0203 /* Number */: case 0x0003 /* BIFF2NUM */: case 0x0002 /* BIFF2INT */: {
-					if(out["!type"] == "chart") if(options.dense ? (out["!data"][val.r]||[])[val.c]: out[encode_col(val.c) + encode_row(val.r)]) ++val.c;
+					if(out["!type"] == "chart") if(options.dense ? (out[val.r]||[])[val.c]: out[encode_cell({c:val.c, r:val.r})]) ++val.c;
 					temp_val = ({ixfe: val.ixfe, XF: XFs[val.ixfe]||{}, v:val.val, t:'n'}/*:any*/);
-					if(BIFF2Fmt > 0) temp_val.z = (temp_val.XF && temp_val.XF.numFmtId) && BIFF2FmtTable[temp_val.XF.numFmtId] || BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
+					if(BIFF2Fmt > 0) temp_val.z = BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
 					safe_format_xf(temp_val, options, wb.opts.Date1904);
 					addcell({c:val.c, r:val.r}, temp_val, options);
 				} break;
 				case 0x0005: case 0x0205 /* BoolErr */: {
 					temp_val = ({ixfe: val.ixfe, XF: XFs[val.ixfe], v:val.val, t:val.t}/*:any*/);
-					if(BIFF2Fmt > 0) temp_val.z = (temp_val.XF && temp_val.XF.numFmtId) && BIFF2FmtTable[temp_val.XF.numFmtId] || BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
+					if(BIFF2Fmt > 0) temp_val.z = BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
 					safe_format_xf(temp_val, options, wb.opts.Date1904);
 					addcell({c:val.c, r:val.r}, temp_val, options);
 				} break;
 				case 0x027e /* RK */: {
 					temp_val = ({ixfe: val.ixfe, XF: XFs[val.ixfe], v:val.rknum, t:'n'}/*:any*/);
-					if(BIFF2Fmt > 0) temp_val.z = (temp_val.XF && temp_val.XF.numFmtId) && BIFF2FmtTable[temp_val.XF.numFmtId] || BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
+					if(BIFF2Fmt > 0) temp_val.z = BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
 					safe_format_xf(temp_val, options, wb.opts.Date1904);
 					addcell({c:val.c, r:val.r}, temp_val, options);
 				} break;
@ -393,7 +389,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 					for(var j = val.c; j <= val.C; ++j) {
 						var ixfe = val.rkrec[j-val.c][0];
 						temp_val= ({ixfe:ixfe, XF:XFs[ixfe], v:val.rkrec[j-val.c][1], t:'n'}/*:any*/);
-						if(BIFF2Fmt > 0) temp_val.z = (temp_val.XF && temp_val.XF.numFmtId) && BIFF2FmtTable[temp_val.XF.numFmtId] || BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
+						if(BIFF2Fmt > 0) temp_val.z = BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
 						safe_format_xf(temp_val, options, wb.opts.Date1904);
 						addcell({c:j, r:val.r}, temp_val, options);
 					}
@ -408,10 +404,10 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 							var _fr = _f[0][0][1][0], _fc = _f[0][0][1][1];
 							var _fe = encode_cell({r:_fr, c:_fc});
 							if(sharedf[_fe]) temp_val.f = ""+stringify_formula(val.formula,range,val.cell,supbooks, opts);
-							else temp_val.F = ((options.dense ? (out["!data"][_fr]||[])[_fc]: out[_fe]) || {}).F;
+							else temp_val.F = ((options.dense ? (out[_fr]||[])[_fc]: out[_fe]) || {}).F;
 						} else temp_val.f = ""+stringify_formula(val.formula,range,val.cell,supbooks, opts);
 					}
-					if(BIFF2Fmt > 0) temp_val.z = (temp_val.XF && temp_val.XF.numFmtId) && BIFF2FmtTable[temp_val.XF.numFmtId] || BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
+					if(BIFF2Fmt > 0) temp_val.z = BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
 					safe_format_xf(temp_val, options, wb.opts.Date1904);
 					addcell(val.cell, temp_val, options);
 					last_formula = val;
@ -424,7 +420,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 						if(options.cellFormula) {
 							temp_val.f = ""+stringify_formula(last_formula.formula, range, last_formula.cell, supbooks, opts);
 						}
-						if(BIFF2Fmt > 0) temp_val.z = (temp_val.XF && temp_val.XF.numFmtId) && BIFF2FmtTable[temp_val.XF.numFmtId] || BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
+						if(BIFF2Fmt > 0) temp_val.z = BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
 						safe_format_xf(temp_val, options, wb.opts.Date1904);
 						addcell(last_formula.cell, temp_val, options);
 						last_formula = null;
@ -433,7 +429,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 				case 0x0021: case 0x0221 /* Array */: {
 					arrayf.push(val);
 					var _arraystart = encode_cell(val[0].s);
-					cc = options.dense ? (out["!data"][val[0].s.r]||[])[val[0].s.c] : out[_arraystart];
+					cc = options.dense ? (out[val[0].s.r]||[])[val[0].s.c] : out[_arraystart];
 					if(options.cellFormula && cc) {
 						if(!last_formula) break; /* technically unreachable */
 						if(!_arraystart || !cc) break;
@ -447,7 +443,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 						/* TODO: capture range */
 						if(!last_formula) break; /* technically unreachable */
 						sharedf[encode_cell(last_formula.cell)]= val[0];
-						cc = options.dense ? (out["!data"][last_formula.cell.r]||[])[last_formula.cell.c] : out[encode_cell(last_formula.cell)];
+						cc = options.dense ? (out[last_formula.cell.r]||[])[last_formula.cell.c] : out[encode_cell(last_formula.cell)];
 						(cc||{}).f = ""+stringify_formula(val[0], range, lastcell, supbooks, opts);
 					}
 				} break;
@ -455,13 +451,13 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 					temp_val=make_cell(sst[val.isst].t, val.ixfe, 's');
 					if(sst[val.isst].h) temp_val.h = sst[val.isst].h;
 					temp_val.XF = XFs[temp_val.ixfe];
-					if(BIFF2Fmt > 0) temp_val.z = (temp_val.XF && temp_val.XF.numFmtId) && BIFF2FmtTable[temp_val.XF.numFmtId] || BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
+					if(BIFF2Fmt > 0) temp_val.z = BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
 					safe_format_xf(temp_val, options, wb.opts.Date1904);
 					addcell({c:val.c, r:val.r}, temp_val, options);
 					break;
 				case 0x0201 /* Blank */: if(options.sheetStubs) {
 					temp_val = ({ixfe: val.ixfe, XF: XFs[val.ixfe], t:'z'}/*:any*/);
-					if(BIFF2Fmt > 0) temp_val.z = (temp_val.XF && temp_val.XF.numFmtId) && BIFF2FmtTable[temp_val.XF.numFmtId] || BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
+					if(BIFF2Fmt > 0) temp_val.z = BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
 					safe_format_xf(temp_val, options, wb.opts.Date1904);
 					addcell({c:val.c, r:val.r}, temp_val, options);
 				} break;
@ -469,7 +465,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 					for(var _j = val.c; _j <= val.C; ++_j) {
 						var _ixfe = val.ixfe[_j-val.c];
 						temp_val= ({ixfe:_ixfe, XF:XFs[_ixfe], t:'z'}/*:any*/);
-						if(BIFF2Fmt > 0) temp_val.z = (temp_val.XF && temp_val.XF.numFmtId) && BIFF2FmtTable[temp_val.XF.numFmtId] || BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
+						if(BIFF2Fmt > 0) temp_val.z = BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
 						safe_format_xf(temp_val, options, wb.opts.Date1904);
 						addcell({c:_j, r:val.r}, temp_val, options);
 					}
@ -478,7 +474,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 				case 0x0204 /* Label */: case 0x0004 /* BIFF2STR */:
 					temp_val=make_cell(val.val, val.ixfe, 's');
 					temp_val.XF = XFs[temp_val.ixfe];
-					if(BIFF2Fmt > 0) temp_val.z = (temp_val.XF && temp_val.XF.numFmtId) && BIFF2FmtTable[temp_val.XF.numFmtId] || BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
+					if(BIFF2Fmt > 0) temp_val.z = BIFF2FmtTable[(temp_val.ixfe>>8) & 0x3F];
 					safe_format_xf(temp_val, options, wb.opts.Date1904);
 					addcell({c:val.c, r:val.r}, temp_val, options);
 					break;
@ -490,7 +486,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 					sst = val;
 				} break;
 				case 0x041e /* Format */: { /* val = [id, fmt] */
-					if(opts.biff >= 3 && opts.biff <= 4) {
+					if(opts.biff == 4) {
 						BIFF2FmtTable[BIFF2Fmt++] = val[1];
 						for(var b4idx = 0; b4idx < BIFF2Fmt + 163; ++b4idx) if(table_fmt[b4idx] == val[1]) break;
 						if(b4idx >= 163) SSF__load(val[1], BIFF2Fmt + 163);
@ -512,24 +508,25 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 				case 0x01b8 /* HLink */: {
 					for(rngR = val[0].s.r; rngR <= val[0].e.r; ++rngR)
 						for(rngC = val[0].s.c; rngC <= val[0].e.c; ++rngC) {
-							cc = options.dense ? (out["!data"][rngR]||[])[rngC] : out[encode_cell({c:rngC,r:rngR})];
+							cc = options.dense ? (out[rngR]||[])[rngC] : out[encode_cell({c:rngC,r:rngR})];
 							if(cc) cc.l = val[1];
 						}
 				} break;
 				case 0x0800 /* HLinkTooltip */: {
 					for(rngR = val[0].s.r; rngR <= val[0].e.r; ++rngR)
 						for(rngC = val[0].s.c; rngC <= val[0].e.c; ++rngC) {
-							cc = options.dense ? (out["!data"][rngR]||[])[rngC] : out[encode_cell({c:rngC,r:rngR})];
+							cc = options.dense ? (out[rngR]||[])[rngC] : out[encode_cell({c:rngC,r:rngR})];
 							if(cc && cc.l) cc.l.Tooltip = val[1];
 							}
 				} break;
 				case 0x001c /* Note */: {
-					/* TODO: comment continuation (row == -1 / 0xFFFF) */
-					cc = options.dense ? (out["!data"][val[0].r]||[])[val[0].c] : out[encode_cell(val[0])];
+					if(opts.biff <= 5 && opts.biff >= 2) break; /* TODO: BIFF5 */
+					cc = options.dense ? (out[val[0].r]||[])[val[0].c] : out[encode_cell(val[0])];
+					var noteobj = objects[val[2]];
 					if(!cc) {
 						if(options.dense) {
-							if(!out["!data"][val[0].r]) out["!data"][val[0].r] = [];
-							cc = out["!data"][val[0].r][val[0].c] = ({t:"z"}/*:any*/);
+							if(!out[val[0].r]) out[val[0].r] = [];
+							cc = out[val[0].r][val[0].c] = ({t:"z"}/*:any*/);
 						} else {
 							cc = out[encode_cell(val[0])] = ({t:"z"}/*:any*/);
 						}
@ -539,12 +536,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 						range.s.c = Math.min(range.s.c, val[0].c);
 					}
 					if(!cc.c) cc.c = [];
-					if(opts.biff <= 5 && opts.biff >= 2) cmnt = {a:"SheetJ5", t:val[1]};
-					else {
-						var noteobj = objects[val[2]];
-						cmnt = {a:val[1],t:noteobj.TxO.t};
-						if(val[3] != null && !(val[3] & 0x02)) cc.c.hidden = true;
-					}
+					cmnt = {a:val[1],t:noteobj.TxO.t};
 					cc.c.push(cmnt);
 				} break;
 				case 0x087d /* XFExt */: update_xfext(XFs[val.ixfe], val.ext); break;
--- a/bits/77_parsetab.js
+++ b/bits/77_parsetab.js
@ -482,7 +482,7 @@ var XLSBRecordEnum = {
 	/*::[*/0x0224/*::]*/: { /* n:"BrtFileSharing" */ },
 	/*::[*/0x0225/*::]*/: { /* n:"BrtOleSize" */ },
 	/*::[*/0x0226/*::]*/: { /* n:"BrtDrawing", */ f:parse_RelID },
-	/*::[*/0x0227/*::]*/: { /* n:"BrtLegacyDrawing", */ f:parse_XLNullableWideString },
+	/*::[*/0x0227/*::]*/: { /* n:"BrtLegacyDrawing" */ },
 	/*::[*/0x0228/*::]*/: { /* n:"BrtLegacyDrawingHF" */ },
 	/*::[*/0x0229/*::]*/: { /* n:"BrtWebOpt" */ },
 	/*::[*/0x022A/*::]*/: { /* n:"BrtBeginWebPubItems", */ T:1 },
@ -1221,7 +1221,7 @@ var XLSRecordEnum = {
 	/*::[*/0x0002/*::]*/: { /* n:"BIFF2INT", */ f:parse_BIFF2INT },
 	/*::[*/0x0003/*::]*/: { /* n:"BIFF2NUM", */ f:parse_BIFF2NUM },
 	/*::[*/0x0004/*::]*/: { /* n:"BIFF2STR", */ f:parse_BIFF2STR },
-	/*::[*/0x0005/*::]*/: { /* n:"BIFF2BOOLERR", */ f:parse_BIFF2BOOLERR },
+	/*::[*/0x0005/*::]*/: { /* n:"BoolErr", */ f:parse_BoolErr },
 	/*::[*/0x0007/*::]*/: { /* n:"String", */ f:parse_BIFF2STRING },
 	/*::[*/0x0008/*::]*/: { /* n:"BIFF2ROW", */ },
 	/*::[*/0x0009/*::]*/: { /* n:"BOF", */ f:parse_BOF },
@ -1233,34 +1233,34 @@ var XLSRecordEnum = {
 	/*::[*/0x0021/*::]*/: { /* n:"Array", */ f:parse_Array },
 	/*::[*/0x0024/*::]*/: { /* n:"COLWIDTH", */ },
 	/*::[*/0x0025/*::]*/: { /* n:"DefaultRowHeight", */ f:parse_DefaultRowHeight },
-	// 0x002c ??
-	// 0x002d ??
-	// 0x002e ??
-	// 0x0030 FONTCOUNT: number of fonts
+	// 0x2c ??
+	// 0x2d ??
+	// 0x2e ??
+	// 0x30 FONTCOUNT: number of fonts
 	/*::[*/0x0032/*::]*/: { /* n:"BIFF2FONTXTRA", */ f:parse_BIFF2FONTXTRA },
-	// 0x0035: INFOOPTS
-	// 0x0036: TABLE (BIFF2 only)
-	// 0x0037: TABLE2 (BIFF2 only)
-	// 0x0038: WNDESK
-	// 0x0039 ??
-	// 0x003a: BEGINPREF
-	// 0x003b: ENDPREF
+	// 0x35: INFOOPTS
+	// 0x36: TABLE (BIFF2 only)
+	// 0x37: TABLE2 (BIFF2 only)
+	// 0x38: WNDESK
+	// 0x39 ??
+	// 0x3a: BEGINPREF
+	// 0x3b: ENDPREF
 	/*::[*/0x003e/*::]*/: { /* n:"BIFF2WINDOW2", */ },
-	// 0x003f ??
-	// 0x0046: SHOWSCROLL
-	// 0x0047: SHOWFORMULA
-	// 0x0048: STATUSBAR
-	// 0x0049: SHORTMENUS
-	// 0x004A:
-	// 0x004B:
-	// 0x004C:
-	// 0x004E:
-	// 0x004F:
-	// 0x0058: TOOLBAR (BIFF3)
+	// 0x3f ??
+	// 0x46: SHOWSCROLL
+	// 0x47: SHOWFORMULA
+	// 0x48: STATUSBAR
+	// 0x49: SHORTMENUS
+	// 0x4A:
+	// 0x4B:
+	// 0x4C:
+	// 0x4E:
+	// 0x4F:
+	// 0x58: TOOLBAR (BIFF3)

 	/* - - - */
 	/*::[*/0x0034/*::]*/: { /* n:"DDEObjName", */ },
-	/*::[*/0x0043/*::]*/: { /* n:"BIFF2XF", */ f:parse_BIFF2XF },
+	/*::[*/0x0043/*::]*/: { /* n:"BIFF2XF", */ },
 	/*::[*/0x0044/*::]*/: { /* n:"BIFF2XFINDEX", */ f:parseuint16 },
 	/*::[*/0x0045/*::]*/: { /* n:"BIFF2FONTCLR", */ },
 	/*::[*/0x0056/*::]*/: { /* n:"BIFF4FMTCNT", */ }, /* 16-bit cnt, similar to BIFF2 */
@ -1272,7 +1272,7 @@ var XLSRecordEnum = {
 	// 0x8A
 	// 0x8B LH: alternate menu key flag (BIFF3/4)
 	// 0x8E
-	/*::[*/0x008F/*::]*/: { /* n:"BIFF4SheetInfo", */ f:parse_BIFF4SheetInfo },
+	// 0x8F
 	/*::[*/0x0091/*::]*/: { /* n:"Sub", */ },
 	// 0x93 STYLE
 	/*::[*/0x0094/*::]*/: { /* n:"LHRecord", */ },
@ -1298,10 +1298,10 @@ var XLSRecordEnum = {
 	/*::[*/0x0218/*::]*/: { /* n:"Lbl", */ f:parse_Lbl },
 	/*::[*/0x0223/*::]*/: { /* n:"ExternName", */ f:parse_ExternName },
 	/*::[*/0x0231/*::]*/: { /* n:"Font", */ },
-	/*::[*/0x0243/*::]*/: { /* n:"BIFF3XF", */ f:parse_BIFF3XF },
+	/*::[*/0x0243/*::]*/: { /* n:"BIFF3XF", */ },
 	/*::[*/0x0406/*::]*/: { /* n:"Formula", */ f:parse_Formula },
 	/*::[*/0x0409/*::]*/: { /* n:"BOF", */ f:parse_BOF },
-	/*::[*/0x0443/*::]*/: { /* n:"BIFF4XF", */ f:parse_BIFF4XF },
+	/*::[*/0x0443/*::]*/: { /* n:"BIFF4XF", */ },
 	/*::[*/0x086d/*::]*/: { /* n:"FeatInfo", */ },
 	/*::[*/0x0873/*::]*/: { /* n:"FeatInfo11", */ },
 	/*::[*/0x0881/*::]*/: { /* n:"SXAddl12", */ },
--- a/bits/78_writebiff.js
+++ b/bits/78_writebiff.js
@ -31,7 +31,16 @@ function write_biff_continue(ba/*:BufArray*/, type/*:number*/, payload, length/*
 	}
 }

-function write_BIFF2BERR(r/*:number*/, c/*:number*/, val, t/*:string*/) {
+function write_BIFF2Cell(out, r/*:number*/, c/*:number*/) {
+	if(!out) out = new_buf(7);
+	out.write_shift(2, r);
+	out.write_shift(2, c);
+	out.write_shift(2, 0);
+	out.write_shift(1, 0);
+	return out;
+}
+
+function write_BIFF2BERR(r/*:number*/, c/*:number*/, val, t/*:?string*/) {
 	var out = new_buf(9);
 	write_BIFF2Cell(out, r, c);
 	write_Bes(val, t || 'b', out);
@ -47,371 +56,62 @@ function write_BIFF2LABEL(r/*:number*/, c/*:number*/, val) {
 	return out.l < out.length ? out.slice(0, out.l) : out;
 }

-function write_comments_biff2(ba/*:BufArray*/, comments/*:Array<[Comment[], number, number]>*/) {
-	comments.forEach(function(data) {
-		var text = data[0].map(function(cc) { return cc.t; }).join("");
-		// TODO: should '\n' be translated to '\r' to correct for Excel 5.0 bug when exporting to BIFF2/3 ?
-		if(text.length <= 2048) return write_biff_rec(ba, 0x001C, write_NOTE_BIFF2(text, data[1], data[2]));
-		write_biff_rec(ba, 0x001C, write_NOTE_BIFF2(text.slice(0, 2048), data[1], data[2], text.length));
-		for(var i = 2048; i < text.length; i += 2048)
-			write_biff_rec(ba, 0x001C, write_NOTE_BIFF2(text.slice(i, Math.min(i+2048, text.length)), -1, -1, Math.min(2048, text.length - i)));
-	});
-}
-
-/* TODO: BIFF3/4 use different records -- see comments*/
-function write_ws_biff2_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:number*/, opts, date1904/*:boolean*/) {
-	var ifmt = 0;
-	if(cell.z != null) {
-		ifmt = opts._BIFF2FmtTable.indexOf(cell.z);
-		if(ifmt == -1) { opts._BIFF2FmtTable.push(cell.z); ifmt = opts._BIFF2FmtTable.length - 1; }
-	}
-	var ixfe = 0;
-	if(cell.z != null) {
-		for(; ixfe < opts.cellXfs.length; ++ixfe) if(opts.cellXfs[ixfe].numFmtId == ifmt) break;
-		if(ixfe == opts.cellXfs.length) opts.cellXfs.push({numFmtId: ifmt});
-	}
+function write_ws_biff2_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:number*//*::, opts*/) {
 	if(cell.v != null) switch(cell.t) {
 		case 'd': case 'n':
-			var v = cell.t == 'd' ? datenum(parseDate(cell.v, date1904), date1904) : cell.v;
-			if(opts.biff == 2 && (v == (v|0)) && (v >= 0) && (v < 65536))
-				// 0x027E (RK) in BIFF3/4
-				write_biff_rec(ba, 0x0002, write_BIFF2INT(R, C, v, ixfe, ifmt));
-			else if(isNaN(v))
-				// 0x0205 in BIFF3/4
-				write_biff_rec(ba, 0x0005, write_BIFF2BERR(R, C, 0x24, "e")); // #NUM!
-			else if(!isFinite(v))
-				// 0x0205 in BIFF3/4
-				write_biff_rec(ba, 0x0005, write_BIFF2BERR(R, C, 0x07, "e")); // #DIV/0!
+			var v = cell.t == 'd' ? datenum(parseDate(cell.v)) : cell.v;
+			if((v == (v|0)) && (v >= 0) && (v < 65536))
+				write_biff_rec(ba, 0x0002, write_BIFF2INT(R, C, v));
 			else
-				// 0x0203 in BIFF3/4
-				write_biff_rec(ba, 0x0003, write_BIFF2NUM(R,C, v, ixfe, ifmt));
+				write_biff_rec(ba, 0x0003, write_BIFF2NUM(R,C, v));
 			return;
-		case 'b': case 'e':
-			// 0x0205 in BIFF3/4
-			write_biff_rec(ba, 0x0005, write_BIFF2BERR(R, C, cell.v, cell.t)); return;
+		case 'b': case 'e': write_biff_rec(ba, 0x0005, write_BIFF2BERR(R, C, cell.v, cell.t)); return;
 		/* TODO: codepage, sst */
 		case 's': case 'str':
-			// 0x0204 in BIFF3/4
-			write_biff_rec(ba, 0x0004, write_BIFF2LABEL(R, C, cell.v == null ? "" : String(cell.v).slice(0,255)));
+			write_biff_rec(ba, 0x0004, write_BIFF2LABEL(R, C, (cell.v||"").slice(0,255)));
 			return;
 	}
-	// 0x0201 in BIFF3/4
 	write_biff_rec(ba, 0x0001, write_BIFF2Cell(null, R, C));
 }

-function write_ws_biff2(ba/*:BufArray*/, ws/*:Worksheet*/, idx/*:number*/, opts, wb/*:Workbook*/) {
-	var dense = ws["!data"] != null;
+function write_ws_biff2(ba/*:BufArray*/, ws/*:Worksheet*/, idx/*:number*/, opts/*::, wb:Workbook*/) {
+	var dense = Array.isArray(ws);
 	var range = safe_decode_range(ws['!ref'] || "A1"), ref/*:string*/, rr = "", cols/*:Array<string>*/ = [];
 	if(range.e.c > 0xFF || range.e.r > 0x3FFF) {
 		if(opts.WTF) throw new Error("Range " + (ws['!ref'] || "A1") + " exceeds format limit A1:IV16384");
 		range.e.c = Math.min(range.e.c, 0xFF);
 		range.e.r = Math.min(range.e.c, 0x3FFF);
+		ref = encode_range(range);
 	}
-	var date1904 = (((wb||{}).Workbook||{}).WBProps||{}).date1904;
-	var row = [], comments = [];
-	/* TODO: 0x0000 / 0x0200 dimensions? */
-	for(var C = range.s.c; C <= range.e.c; ++C) cols[C] = encode_col(C);
 	for(var R = range.s.r; R <= range.e.r; ++R) {
-		if(dense) row = ws["!data"][R] || [];
 		rr = encode_row(R);
-		for(C = range.s.c; C <= range.e.c; ++C) {
-			var cell = dense ? row[C] : ws[cols[C] + rr];
+		for(var C = range.s.c; C <= range.e.c; ++C) {
+			if(R === range.s.r) cols[C] = encode_col(C);
+			ref = cols[C] + rr;
+			var cell = dense ? (ws[R]||[])[C] : ws[ref];
 			if(!cell) continue;
 			/* write cell */
-			write_ws_biff2_cell(ba, cell, R, C, opts, date1904);
-			if(cell.c) comments.push([cell.c, R, C]);
+			write_ws_biff2_cell(ba, cell, R, C, opts);
 		}
 	}
-
-	/* ... 0x12 0x19 0x13 (Password) */
-	write_comments_biff2(ba, comments);
-	/* 0x3d (Window1) ... */
 }

 /* Based on test files */
 function write_biff2_buf(wb/*:Workbook*/, opts/*:WriteOpts*/) {
 	var o = opts || {};
-
+	if(DENSE != null && o.dense == null) o.dense = DENSE;
 	var ba = buf_array();
 	var idx = 0;
 	for(var i=0;i<wb.SheetNames.length;++i) if(wb.SheetNames[i] == o.sheet) idx=i;
 	if(idx == 0 && !!o.sheet && wb.SheetNames[0] != o.sheet) throw new Error("Sheet not found: " + o.sheet);
 	write_biff_rec(ba, (o.biff == 4 ? 0x0409 : (o.biff == 3 ? 0x0209 : 0x0009)), write_BOF(wb, 0x10, o));
-	if(((wb.Workbook||{}).WBProps||{}).date1904) write_biff_rec(ba, 0x0022, writebool(true));
-	o.cellXfs = [{numFmtId: 0}];
-	o._BIFF2FmtTable/*:Array<string>*/ = ["General"]; o._Fonts = [];
-	var body = buf_array();
-	write_ws_biff2(body, wb.Sheets[wb.SheetNames[idx]], idx, o, wb);
-
-	o._BIFF2FmtTable.forEach(function(f) {
-		if(o.biff <= 3) write_biff_rec(ba, 0x001E, write_BIFF2Format(f));
-		else write_biff_rec(ba, 0x041E, write_BIFF4Format(f));
-	});
-	o.cellXfs.forEach(function(xf) {
-		switch(o.biff) {
-			case 2: write_biff_rec(ba, 0x0043, write_BIFF2XF(xf)); break;
-			case 3: write_biff_rec(ba, 0x0243, write_BIFF3XF(xf)); break;
-			case 4: write_biff_rec(ba, 0x0443, write_BIFF4XF(xf)); break;
-		}
-	});
-	delete o._BIFF2FmtTable; delete o.cellXfs; delete o._Fonts;
-
-	ba.push(body.end());
+	/* ... */
+	write_ws_biff2(ba, wb.Sheets[wb.SheetNames[idx]], idx, o, wb);
+	/* ... */
 	write_biff_rec(ba, 0x000A);
 	return ba.end();
 }

-var b8oid = 1, b8ocnts/*:Array<[number, number, number]>*/ = [];
-function write_MsoDrawingGroup() {
-	var buf = new_buf(82 + 8 * b8ocnts.length);
-	/* [MS-ODRAW] 2.2.12 OfficeArtDggContainer */
-	buf.write_shift(2, 0x0F);
-	buf.write_shift(2, 0xF000);
-	buf.write_shift(4, 74 + 8 * b8ocnts.length);
-	/* 2.2.48 OfficeArtFDGGBlock */
-	{
-		buf.write_shift(2, 0);
-		buf.write_shift(2, 0xF006);
-		buf.write_shift(4, 16 + 8 * b8ocnts.length);
-		/* 2.2.47 OfficeArtFDGG */
-		{
-			buf.write_shift(4, b8oid);
-			buf.write_shift(4, b8ocnts.length+1);
-			var acc = 0; for(var i = 0; i < b8ocnts.length; ++i) acc += (b8ocnts[i] && b8ocnts[i][1] || 0); buf.write_shift(4, acc);
-			buf.write_shift(4, b8ocnts.length);
-		}
-		/* 2.2.46 OfficeArtIDCL + */
-		b8ocnts.forEach(function(b8) {
-			buf.write_shift(4, b8[0]);
-			buf.write_shift(4, b8[2]);
-		});
-	}
-	/* 2.2.9 OfficeArtFOPT */
-	{
-		buf.write_shift(2, 0x33); // 0x03 | (3 << 4)
-		buf.write_shift(2, 0xF00B);
-		buf.write_shift(4, 0x12); // 3 * 6
-		/* 2.3.21.15 Text Boolean Properties */
-		buf.write_shift(2, 0xBF); buf.write_shift(4, 0x00080008);
-		/* 2.3.7.2 fillColor */
-		buf.write_shift(2, 0x0181); buf.write_shift(4, 0x08000041);
-		/* 2.3.8.1 lineColor */
-		buf.write_shift(2, 0x01C0); buf.write_shift(4, 0x08000040);
-	}
-	/* 2.2.45 OfficeArtSplitMenuColorContainer */
-	{
-		buf.write_shift(2, 0x40);
-		buf.write_shift(2, 0xF11E);
-		buf.write_shift(4, 16);
-		buf.write_shift(4, 0x0800000D);
-		buf.write_shift(4, 0x0800000C);
-		buf.write_shift(4, 0x08000017);
-		buf.write_shift(4, 0x100000F7);
-	}
-	return buf;
-}
-function write_comments_biff8(ba/*:BufArray*/, comments/*:Array<[Comment[], number, number]>*/) {
-	var notes/*:Array<RawData>*/ = [], sz = 0, pl = buf_array(), baseid = b8oid;
-	var _oasc;
-	comments.forEach(function(c, ci) {
-		var author = "";
-		var text = c[0].map(function(t) { if(t.a && !author) author = t.a; return t.t; }).join("");
-		++b8oid;
-
-		/* 2.2.14 OfficeArtSpContainer */
-		{
-			var oasc = new_buf(0x96);
-			oasc.write_shift(2, 0x0F);
-			oasc.write_shift(2, 0xF004);
-			oasc.write_shift(4, 0x96);
-			/* 2.2.40 OfficeArtFSP */
-			{
-				oasc.write_shift(2, 0xca2); // 0x02 | (0xca << 4)
-				oasc.write_shift(2, 0xF00A);
-				oasc.write_shift(4, 8);
-				oasc.write_shift(4, b8oid);
-				oasc.write_shift(4, 0xA00);
-			}
-			/* 2.2.9 OfficeArtFOPT */
-			{
-				oasc.write_shift(2, 0xE3); // 0x03 | (14 << 4)
-				oasc.write_shift(2, 0xF00B);
-				oasc.write_shift(4, 0x54); // 14 * 6
-				/* 2.3.21.1 ITxid */
-				oasc.write_shift(2, 0x80); oasc.write_shift(4, 0);
-				/* 2.3.21.12 txdir */
-				oasc.write_shift(2, 0x8B); oasc.write_shift(4, 0x02);
-				/* 2.3.21.15 Text Boolean Properties */
-				oasc.write_shift(2, 0xBF); oasc.write_shift(4, 0x00080008);
-				/* 2.3.6.30 cxk */
-				oasc.write_shift(2, 0x0158); oasc.l += 4;
-				/* 2.3.7.2 fillColor */
-				oasc.write_shift(2, 0x0181); oasc.write_shift(4, 0x08000050);
-				/* 2.3.7.4 fillBackColor */
-				oasc.write_shift(2, 0x0183); oasc.write_shift(4, 0x08000050);
-				/* 2.3.7.6 fillCrMod */
-				oasc.write_shift(2, 0x0185); oasc.write_shift(4, 0x100000F4);
-				/* 2.3.7.43 Fill Style Boolean Properties */
-				oasc.write_shift(2, 0x01BF); oasc.write_shift(4, 0x00100010);
-				/* 2.3.8.1 lineColor */
-				oasc.write_shift(2, 0x01C0); oasc.write_shift(4, 0x08000051);
-				/* 2.3.8.4 lineCrMod */
-				oasc.write_shift(2, 0x01C3); oasc.write_shift(4, 0x100000F4);
-				/* 2.3.13.2 shadowColor */
-				oasc.write_shift(2, 0x0201); oasc.write_shift(4, 0x08000051);
-				/* 2.3.13.4 shadowCrMod */
-				oasc.write_shift(2, 0x0203); oasc.write_shift(4, 0x100000F4);
-				/* 2.3.13.23 Shadow Style Boolean Properties */
-				oasc.write_shift(2, 0x023F); oasc.write_shift(4, 0x00030001);
-				/* 2.3.4.44 Group Shape Boolean Properties */
-				oasc.write_shift(2, 0x03BF); oasc.write_shift(4, 0x00020000 | (c[0].hidden ? 2 : 0));
-			}
-			/* [MS-XLS] 2.5.193 OfficeArtClientAnchorSheet */
-			{
-				oasc.l += 2;
-				oasc.write_shift(2, 0xF010);
-				oasc.write_shift(4, 0x12);
-				oasc.write_shift(2, 0x3); // do not move or size with cells
-				oasc.write_shift(2, c[2] + 2); oasc.l += 2;
-				oasc.write_shift(2, c[1] + 1); oasc.l += 2;
-				oasc.write_shift(2, c[2] + 4); oasc.l += 2;
-				oasc.write_shift(2, c[1] + 5); oasc.l += 2;
-			}
-			/* [MS-XLS] 2.5.194 OfficeArtClientData */
-			{
-				oasc.l += 2;
-				oasc.write_shift(2, 0xF011);
-				oasc.l += 4;
-			}
-			oasc.l = 0x96;
-			if(ci == 0) /* write_biff_rec(pl, 0x003C, oasc); */ _oasc = oasc;
-			else write_biff_rec(pl, 0x00EC, oasc);
-		}
-		sz += 0x96;
-
-		/* [MS-XLS] 2.4.181 Obj */
-		{
-			var obj = new_buf(52); // 22 + 26 + 4
-			/* [MS-XLS] 2.5.143 FtCmo */
-			obj.write_shift(2, 0x15);
-			obj.write_shift(2, 0x12);
-			obj.write_shift(2, 0x19);
-			obj.write_shift(2, b8oid);
-			obj.write_shift(2, 0);
-			obj.l = 22;
-			/* [MS-XLS] 2.5.149 FtNts */
-			obj.write_shift(2, 0x0D);
-			obj.write_shift(2, 0x16);
-			obj.write_shift(4, 0x62726272);
-			obj.write_shift(4, 0x95374305);
-			obj.write_shift(4, 0x80301328);
-			obj.write_shift(4, 0x69696904 + b8oid*256);
-			obj.write_shift(2,0);
-			obj.write_shift(4,0);
-			// reserved
-			obj.l += 4;
-			write_biff_rec(pl, 0x005D, obj);
-		}
-
-		/* [MS-XLS] 2.5.195 OfficeArtClientTextbox */
-		{
-			var oact = new_buf(8);
-			oact.l += 2;
-			oact.write_shift(2, 0xF00D);
-			oact.l += 4;
-			write_biff_rec(pl, 0x00EC, oact);
-		}
-		sz += 8;
-
-		/* [MS-XLS] 2.4.329 TxO */
-		{
-			var txo = new_buf(18);
-			txo.write_shift(2, 0x12);
-			txo.l += 8;
-			txo.write_shift(2, text.length);
-			txo.write_shift(2, 0x10);
-			txo.l += 4;
-			write_biff_rec(pl, 0x01b6, txo);
-			/* text continue record TODO: switch to wide strings */
-			{
-				var cont = new_buf(1 + text.length);
-				cont.write_shift(1, 0);
-				cont.write_shift(text.length, text, "sbcs");
-				write_biff_rec(pl, 0x003C, cont);
-			}
-			/* formatting continue records */
-			{
-				var conf = new_buf(0x10);
-				conf.l += 8;
-				conf.write_shift(2, text.length);
-				conf.l += 6;
-				write_biff_rec(pl, 0x003C, conf);
-			}
-		}
-
-		/* 2.4.179 Note */
-		{
-			var notesh = new_buf(12 + author.length);
-			notesh.write_shift(2, c[1]);
-			notesh.write_shift(2, c[2]);
-			notesh.write_shift(2, 0 | (c[0].hidden ? 0 : 2));
-			notesh.write_shift(2, b8oid);
-			notesh.write_shift(2, author.length);
-			notesh.write_shift(1, 0);
-			notesh.write_shift(author.length, author, "sbcs");
-			notesh.l ++;
-			notes.push(notesh);
-		}
-	});
-	/* [MS-ODRAW] 2.2.13 OfficeArtDgContainer */
-	{
-		var hdr = new_buf(80);
-		hdr.write_shift(2, 0x0F);
-		hdr.write_shift(2, 0xF002);
-		hdr.write_shift(4, sz + hdr.length - 8);
-		/* [MS-ODRAW] 2.2.49 OfficeArtFDG */
-		{
-			hdr.write_shift(2, 0x10);
-			hdr.write_shift(2, 0xF008);
-			hdr.write_shift(4, 0x08);
-			hdr.write_shift(4, comments.length + 1);
-			hdr.write_shift(4, b8oid);
-		}
-		/* [MS-ODRAW] 2.2.16 OfficeArtSpgrContainer */
-		{
-			hdr.write_shift(2, 0x0f);
-			hdr.write_shift(2, 0xF003);
-			hdr.write_shift(4, sz + 0x30);
-			/* [MS-ODRAW] 2.2.14 OfficeArtSpContainer */
-			{
-				hdr.write_shift(2, 0x0f);
-				hdr.write_shift(2, 0xF004);
-				hdr.write_shift(4, 0x28);
-				/* [MS-ODRAW] 2.2.38 OfficeArtFSPGR */
-				{
-					hdr.write_shift(2, 0x01);
-					hdr.write_shift(2, 0xF009);
-					hdr.write_shift(4, 0x10);
-					hdr.l += 16;
-				}
-				/* [MS-ODRAW] 2.2.40 OfficeArtFSP */
-				{
-					hdr.write_shift(2, 0x02);
-					hdr.write_shift(2, 0xF00A);
-					hdr.write_shift(4, 0x08);
-					hdr.write_shift(4, baseid);
-					hdr.write_shift(4, 0x05);
-				}
-			}
-		}
-		write_biff_rec(ba, 0x00EC, /* hdr */ _oasc ? bconcat([hdr, _oasc]) : hdr);
-	}
-	ba.push(pl.end());
-	notes.forEach(function(n) { write_biff_rec(ba, 0x001C, n); });
-	b8ocnts.push([baseid, comments.length + 1, b8oid]);
-	++b8oid;
-}
-
 function write_FONTS_biff8(ba, data, opts) {
 	write_biff_rec(ba, 0x0031 /* Font */, write_Font({
 		sz:12,
@ -473,7 +173,7 @@ function write_ws_cols_biff8(ba, cols) {
 	});
 }

-function write_ws_biff8_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:number*/, opts, date1904/*:boolean*/) {
+function write_ws_biff8_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:number*/, opts) {
 	var os = 16 + get_cell_style(opts.cellXfs, cell, opts);
 	if(cell.v == null && !cell.bf) {
 		write_biff_rec(ba, 0x0201 /* Blank */, write_XLSCell(R, C, os));
@ -482,11 +182,9 @@ function write_ws_biff8_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:n
 	if(cell.bf) write_biff_rec(ba, 0x0006 /* Formula */, write_Formula(cell, R, C, opts, os));
 	else switch(cell.t) {
 		case 'd': case 'n':
-			var v = cell.t == 'd' ? datenum(parseDate(cell.v, date1904), date1904) : cell.v;
-			if(isNaN(v)) write_biff_rec(ba, 0x0205 /* BoolErr */, write_BoolErr(R, C, 0x24, os, opts, "e")); // #NUM!
-			else if(!isFinite(v)) write_biff_rec(ba, 0x0205 /* BoolErr */, write_BoolErr(R, C, 0x07, os, opts, "e")); // #DIV/0!
+			var v = cell.t == 'd' ? datenum(parseDate(cell.v)) : cell.v;
 			/* TODO: emit RK as appropriate */
-			else write_biff_rec(ba, 0x0203 /* Number */, write_Number(R, C, v, os, opts));
+			write_biff_rec(ba, 0x0203 /* Number */, write_Number(R, C, v, os, opts));
 			break;
 		case 'b': case 'e':
 			write_biff_rec(ba, 0x0205 /* BoolErr */, write_BoolErr(R, C, cell.v, os, opts, cell.t));
@ -494,9 +192,9 @@ function write_ws_biff8_cell(ba/*:BufArray*/, cell/*:Cell*/, R/*:number*/, C/*:n
 		/* TODO: codepage, sst */
 		case 's': case 'str':
 			if(opts.bookSST) {
-				var isst = get_sst_id(opts.Strings, cell.v == null ? "" : String(cell.v), opts.revStrings);
+				var isst = get_sst_id(opts.Strings, cell.v, opts.revStrings);
 				write_biff_rec(ba, 0x00fd /* LabelSst */, write_LabelSst(R, C, isst, os, opts));
-			} else write_biff_rec(ba, 0x0204 /* Label */, write_Label(R, C, (cell.v == null ? "" : String(cell.v)).slice(0,255), os, opts));
+			} else write_biff_rec(ba, 0x0204 /* Label */, write_Label(R, C, (cell.v||"").slice(0,255), os, opts));
 			break;
 		default:
 			write_biff_rec(ba, 0x0201 /* Blank */, write_XLSCell(R, C, os));
@ -509,7 +207,7 @@ function write_ws_biff8(idx/*:number*/, opts, wb/*:Workbook*/) {
 	var s = wb.SheetNames[idx], ws = wb.Sheets[s] || {};
 	var _WB/*:WBWBProps*/ = ((wb||{}).Workbook||{}/*:any*/);
 	var _sheet/*:WBWSProp*/ = ((_WB.Sheets||[])[idx]||{}/*:any*/);
-	var dense = ws["!data"] != null;
+	var dense = Array.isArray(ws);
 	var b8 = opts.biff == 8;
 	var ref/*:string*/, rr = "", cols/*:Array<string>*/ = [];
 	var range = safe_decode_range(ws['!ref'] || "A1");
@ -543,27 +241,24 @@ function write_ws_biff8(idx/*:number*/, opts, wb/*:Workbook*/) {
 	write_biff_rec(ba, 0x0200 /* Dimensions */, write_Dimensions(range, opts));
 	/* ... */

-	var date1904 = (((wb||{}).Workbook||{}).WBProps||{}).date1904;
 	if(b8) ws['!links'] = [];
 	var comments = [];
-	var row = [];
-	for(var C = range.s.c; C <= range.e.c; ++C) cols[C] = encode_col(C);
 	for(var R = range.s.r; R <= range.e.r; ++R) {
-		if(dense) row = ws["!data"][R] || [];
 		rr = encode_row(R);
-		for(C = range.s.c; C <= range.e.c; ++C) {
+		for(var C = range.s.c; C <= range.e.c; ++C) {
+			if(R === range.s.r) cols[C] = encode_col(C);
 			ref = cols[C] + rr;
-			var cell = dense ? row[C] : ws[ref];
+			var cell = dense ? (ws[R]||[])[C] : ws[ref];
 			if(!cell) continue;
 			/* write cell */
-			write_ws_biff8_cell(ba, cell, R, C, opts, date1904);
+			write_ws_biff8_cell(ba, cell, R, C, opts);
 			if(b8 && cell.l) ws['!links'].push([ref, cell.l]);
-			if(cell.c) comments.push([cell.c, R, C]);
+			if(b8 && cell.c) comments.push([ref, cell.c]);
 		}
 	}
 	var cname/*:string*/ = _sheet.CodeName || _sheet.name || s;
 	/* ... */
-	if(b8) write_comments_biff8(ba, comments); else write_comments_biff2(ba, comments);
+	// if(b8) comments.forEach(function(comment) { write_biff_rec(ba, 0x001c /* Note */, write_NoteSh(comment)); });
 	/* ... */
 	if(b8) write_biff_rec(ba, 0x023e /* Window2 */, write_Window2((_WB.Views||[])[0]));
 	/* ... */
@ -633,10 +328,8 @@ function write_biff8_global(wb/*:Workbook*/, bufs, opts/*:WriteOpts*/) {
 	var C = buf_array();
 	/* METADATA [MTRSettings] [ForceFullCalculation] */
 	if(b8) write_biff_rec(C, 0x008C /* Country */, write_Country());
-	/* *SUPBOOK *LBL *RTD [RecalcId] *HFPicture */
+	/* *SUPBOOK *LBL *RTD [RecalcId] *HFPicture *MSODRAWINGGROUP */

-	/* BIFF8: MsoDrawingGroup [*Continue] */
-	if(b8 && b8ocnts.length) write_biff_rec(C, 0x00EB /* MsoDrawingGroup */, write_MsoDrawingGroup());
 	/* BIFF8: [SST *Continue] ExtSST */
 	if(b8 && opts.Strings) write_biff_continue(C, 0x00FC /* SST */, write_SST(opts.Strings, opts));

@ -679,7 +372,6 @@ function write_biff8_buf(wb/*:Workbook*/, opts/*:WriteOpts*/) {
 		o.ssf = wb.SSF;
 	}

-	b8oid = 1; b8ocnts = [];
 	o.Strings = /*::((*/[]/*:: :any):SST)*/; o.Strings.Count = 0; o.Strings.Unique = 0;
 	fix_write_opts(o);

--- a/bits/79_html.js
+++ b/bits/79_html.js
@ -1,8 +1,8 @@
 /* note: browser DOM element cannot see mso- style attrs, must parse */
 function html_to_sheet(str/*:string*/, _opts)/*:Workbook*/ {
 	var opts = _opts || {};
-	var dense = (opts.dense != null) ? opts.dense : DENSE;
-	var ws/*:Worksheet*/ = ({}/*:any*/); if(dense) ws["!data"] = [];
+	if(DENSE != null && opts.dense == null) opts.dense = DENSE;
+	var ws/*:Worksheet*/ = opts.dense ? ([]/*:any*/) : ({}/*:any*/);
 	str = str.replace(/<!--.*?-->/g, "");
 	var mtch/*:any*/ = str.match(/<table/i);
 	if(!mtch) throw new Error("Invalid HTML: could not find <table>");
@ -45,12 +45,10 @@ function html_to_sheet(str/*:string*/, _opts)/*:Workbook*/ {
 			else if(!isNaN(fuzzynum(m))) o = {t:'n', v:fuzzynum(m)};
 			else if(!isNaN(fuzzydate(m).getDate())) {
 				o = ({t:'d', v:parseDate(m)}/*:any*/);
-				if(opts.UTC === false) o.v = utc_to_local(o.v);
 				if(!opts.cellDates) o = ({t:'n', v:datenum(o.v)}/*:any*/);
 				o.z = opts.dateNF || table_fmt[14];
 			}
-			if(o.cellText !== false) o.w = m;
-			if(dense) { if(!ws["!data"][R]) ws["!data"][R] = []; ws["!data"][R][C] = o; }
+			if(opts.dense) { if(!ws[R]) ws[R] = []; ws[R][C] = o; }
 			else ws[encode_cell({r:R, c:C})] = o;
 			C += CS;
 		}
@ -63,7 +61,6 @@ function make_html_row(ws/*:Worksheet*/, r/*:Range*/, R/*:number*/, o/*:Sheet2HT
 	var M/*:Array<Range>*/ = (ws['!merges'] ||[]);
 	var oo/*:Array<string>*/ = [];
 	var sp = ({}/*:any*/);
-	var dense = ws["!data"] != null;
 	for(var C = r.s.c; C <= r.e.c; ++C) {
 		var RS = 0, CS = 0;
 		for(var j = 0; j < M.length; ++j) {
@ -73,8 +70,8 @@ function make_html_row(ws/*:Worksheet*/, r/*:Range*/, R/*:number*/, o/*:Sheet2HT
 			RS = M[j].e.r - M[j].s.r + 1; CS = M[j].e.c - M[j].s.c + 1; break;
 		}
 		if(RS < 0) continue;
-		var coord = encode_col(C) + encode_row(R);
-		var cell = dense ? (ws["!data"][R]||[])[C] : ws[coord];
+		var coord = encode_cell({r:R,c:C});
+		var cell = o.dense ? (ws[R]||[])[C] : ws[coord];
 		/* TODO: html entities */
 		var w = (cell && cell.v != null) && (cell.h || escapehtml(cell.w || (format_cell(cell), cell.w) || "")) || "";
 		sp = ({}/*:any*/);
@ -83,10 +80,9 @@ function make_html_row(ws/*:Worksheet*/, r/*:Range*/, R/*:number*/, o/*:Sheet2HT
 		if(o.editable) w = '<span contenteditable="true">' + w + '</span>';
 		else if(cell) {
 			sp["data-t"] = cell && cell.t || 'z';
-			// note: data-v is unaffected by the timezone interpretation
-			if(cell.v != null) sp["data-v"] = cell.v instanceof Date ? cell.v.toISOString() : cell.v;
+			if(cell.v != null) sp["data-v"] = cell.v;
 			if(cell.z != null) sp["data-z"] = cell.z;
-			if(cell.l && (cell.l.Target || "#").charAt(0) != "#") w = '<a href="' + escapehtml(cell.l.Target) +'">' + w + '</a>';
+			if(cell.l && (cell.l.Target || "#").charAt(0) != "#") w = '<a href="' + cell.l.Target +'">' + w + '</a>';
 		}
 		sp.id = (o.id || "sjs") + "-" + coord;
 		oo.push(writextag('td', w, sp));
@ -122,9 +118,10 @@ function sheet_to_html(ws/*:Worksheet*/, opts/*:?Sheet2HTMLOpts*//*, wb:?Workboo
 	var header = o.header != null ? o.header : HTML_BEGIN;
 	var footer = o.footer != null ? o.footer : HTML_END;
 	var out/*:Array<string>*/ = [header];
-	var r = decode_range(ws['!ref'] || "A1");
+	var r = decode_range(ws['!ref']);
+	o.dense = Array.isArray(ws);
 	out.push(make_html_preamble(ws, r, o));
-	if(ws["!ref"]) for(var R = r.s.r; R <= r.e.r; ++R) out.push(make_html_row(ws, r, R, o));
+	for(var R = r.s.r; R <= r.e.r; ++R) out.push(make_html_row(ws, r, R, o));
 	out.push("</table>" + footer);
 	return out.join("");
 }
@ -137,7 +134,7 @@ function sheet_add_dom(ws/*:Worksheet*/, table/*:HTMLElement*/, _opts/*:?any*/)/
 	}

 	var opts = _opts || {};
-	var dense = ws["!data"] != null;
+	if(DENSE != null) opts.dense = DENSE;
 	var or_R = 0, or_C = 0;
 	if(opts.origin != null) {
 		if(typeof opts.origin == 'number') or_R = opts.origin;
@ -190,7 +187,6 @@ function sheet_add_dom(ws/*:Worksheet*/, table/*:HTMLElement*/, _opts/*:?any*/)/
 				else if(!isNaN(fuzzynum(v))) o = {t:'n', v:fuzzynum(v)};
 				else if(!isNaN(fuzzydate(v).getDate())) {
 					o = ({t:'d', v:parseDate(v)}/*:any*/);
-					if(opts.UTC) o.v = local_to_utc(o.v);
 					if(!opts.cellDates) o = ({t:'n', v:datenum(o.v)}/*:any*/);
 					o.z = opts.dateNF || table_fmt[14];
 				}
@ -203,7 +199,7 @@ function sheet_add_dom(ws/*:Worksheet*/, table/*:HTMLElement*/, _opts/*:?any*/)/
 				l = Aelts[Aelti].getAttribute("href"); if(l.charAt(0) != "#") break;
 			}
 			if(l && l.charAt(0) != "#" &&	l.slice(0, 11).toLowerCase() != 'javascript:') o.l = ({ Target: l });
-			if(dense) { if(!ws["!data"][R + or_R]) ws["!data"][R + or_R] = []; ws["!data"][R + or_R][C + or_C] = o; }
+			if(opts.dense) { if(!ws[R + or_R]) ws[R + or_R] = []; ws[R + or_R][C + or_C] = o; }
 			else ws[encode_cell({c:C + or_C, r:R + or_R})] = o;
 			if(range.e.c < C + or_C) range.e.c = C + or_C;
 			C += CS;
@ -219,7 +215,7 @@ function sheet_add_dom(ws/*:Worksheet*/, table/*:HTMLElement*/, _opts/*:?any*/)/

 function parse_dom_table(table/*:HTMLElement*/, _opts/*:?any*/)/*:Worksheet*/ {
 	var opts = _opts || {};
-	var ws/*:Worksheet*/ = ({}/*:any*/); if(opts.dense) ws["!data"] = [];
+	var ws/*:Worksheet*/ = opts.dense ? ([]/*:any*/) : ({}/*:any*/);
 	return sheet_add_dom(ws, table, _opts);
 }

--- a/bits/80_parseods.js
+++ b/bits/80_parseods.js
@ -245,11 +245,11 @@ function parse_content_xml(d/*:string*/, _opts, _nfm)/*:Workbook*/ {
 		var sheetag/*:: = {name:"", '名称':""}*/;
 		var rowtag/*:: = {'行号':""}*/;
 		var Sheets = {}, SheetNames/*:Array<string>*/ = [];
-		var ws = ({}/*:any*/); if(opts.dense) ws["!data"] = [];
+		var ws = opts.dense ? ([]/*:any*/) : ({}/*:any*/);
 		var Rn, q/*:: :any = ({t:"", v:null, z:null, w:"",c:[],}:any)*/;
 		var ctag = ({value:""}/*:any*/);
-		var textp = "", textpidx = 0, textptag/*:: = {}*/, oldtextp = "", oldtextpidx = 0;
-		var textR = [], oldtextR = [];
+		var textp = "", textpidx = 0, textptag/*:: = {}*/;
+		var textR = [];
 		var R = -1, C = -1, range = {s: {r:1000000,c:10000000}, e: {r:0, c:0}};
 		var row_ol = 0;
 		var number_format_map = _nfm || {}, styles = {};
@ -263,6 +263,7 @@ function parse_content_xml(d/*:string*/, _opts, _nfm)/*:Workbook*/ {
 		var creator = "", creatoridx = 0;
 		var isstub = false, intable = false;
 		var i = 0;
+		var baddate = 0;
 		xlmlregex.lastIndex = 0;
 		str = str.replace(/<!--([\s\S]*?)-->/mg,"").replace(/<!DOCTYPE[^\[]*\[[^\]]*\]>/gm,"");
 		while((Rn = xlmlregex.exec(str))) switch((Rn[3]=Rn[3].replace(/_.*$/,""))) {
@ -288,7 +289,7 @@ function parse_content_xml(d/*:string*/, _opts, _nfm)/*:Workbook*/ {
 					sheetag = parsexmltag(Rn[0], false);
 					R = C = -1;
 					range.s.r = range.s.c = 10000000; range.e.r = range.e.c = 0;
-					ws = ({}/*:any*/); if(opts.dense) ws["!data"] = []; merges = [];
+					ws = opts.dense ? ([]/*:any*/) : ({}/*:any*/); merges = [];
 					rowinfo = [];
 					intable = true;
 				}
@ -308,7 +309,7 @@ function parse_content_xml(d/*:string*/, _opts, _nfm)/*:Workbook*/ {
 			case 'covered-table-cell': // 9.1.5 <table:covered-table-cell>
 				if(Rn[1] !== '/') ++C;
 				if(opts.sheetStubs) {
-					if(opts.dense) { if(!ws["!data"][R]) ws["!data"][R] = []; ws["!data"][R][C] = {t:'z'}; }
+					if(opts.dense) { if(!ws[R]) ws[R] = []; ws[R][C] = {t:'z'}; }
 					else ws[encode_cell({r:R,c:C})] = {t:'z'};
 				}
 				textp = ""; textR = [];
@ -324,16 +325,16 @@ function parse_content_xml(d/*:string*/, _opts, _nfm)/*:Workbook*/ {
 					if((ctag['数据类型'] || ctag['value-type']) == "string") {
 						q.t = "s"; q.v = unescapexml(ctag['string-value'] || "");
 						if(opts.dense) {
-							if(!ws["!data"][R]) ws["!data"][R] = [];
-							ws["!data"][R][C] = q;
+							if(!ws[R]) ws[R] = [];
+							ws[R][C] = q;
 						} else {
-							ws[encode_col(C) + encode_row(R)] = q;
+							ws[encode_cell({r:R,c:C})] = q;
 						}
 					}
 					C+= colpeat-1;
 				} else if(Rn[1]!=='/') {
 					++C;
-					textp = oldtextp = ""; textpidx = oldtextpidx = 0; textR = []; oldtextR = [];
+					textp = ""; textpidx = 0; textR = [];
 					colpeat = 1;
 					var rptR = rowpeat ? R + rowpeat - 1 : R;
 					if(C > range.e.c) range.e.c = C;
@ -369,23 +370,19 @@ function parse_content_xml(d/*:string*/, _opts, _nfm)/*:Workbook*/ {
 					/* 19.675.2 table:number-columns-repeated */
 					if(ctag['number-columns-repeated']) colpeat = parseInt(ctag['number-columns-repeated'], 10);

-					/* 19.385 office:value-type TODO: verify ODS and UOS */
+					/* 19.385 office:value-type */
 					switch(q.t) {
 						case 'boolean': q.t = 'b'; q.v = parsexmlbool(ctag['boolean-value']) || (+ctag['boolean-value'] >= 1); break;
-						case 'float': q.t = 'n'; q.v = parseFloat(ctag.value);
-							if(opts.cellDates && q.z && fmt_is_date(q.z)) { q.v = numdate(q.v + (WB.WBProps.date1904 ? 1462 : 0)); q.t = typeof q.v == "number" ? 'n' : 'd'; }
-							break;
+						case 'float': q.t = 'n'; q.v = parseFloat(ctag.value); break;
 						case 'percentage': q.t = 'n'; q.v = parseFloat(ctag.value); break;
 						case 'currency': q.t = 'n'; q.v = parseFloat(ctag.value); break;
-						case 'date': q.t = 'd'; q.v = parseDate(ctag['date-value'], WB.WBProps.date1904);
-							if(!opts.cellDates) { q.t = 'n'; q.v = datenum(q.v, WB.WBProps.date1904); }
+						case 'date': q.t = 'd'; q.v = parseDate(ctag['date-value']);
+							if(!opts.cellDates) { q.t = 'n'; q.v = datenum(q.v, WB.WBProps.date1904) - baddate; }
 							if(!q.z) q.z = 'm/d/yy'; break;
-						/* NOTE: for `time`, Excel ODS export incorrectly uses durations relative to 1900 epoch even if 1904 is specified */
 						case 'time': q.t = 'n'; q.v = parse_isodur(ctag['time-value'])/86400;
-							if(opts.cellDates) { q.v = numdate(q.v); q.t = typeof q.v == "number" ? 'n' : 'd'; }
+							if(opts.cellDates) { q.t = 'd'; q.v = numdate(q.v); }
 							if(!q.z) q.z = 'HH:MM:SS'; break;
-						case 'number': q.t = 'n'; q.v = parseFloat(ctag['数据数值']);
-							break;
+						case 'number': q.t = 'n'; q.v = parseFloat(ctag['数据数值']); break;
 						default:
 							if(q.t === 'string' || q.t === 'text' || !q.t) {
 								q.t = 's';
@ -408,9 +405,9 @@ function parse_content_xml(d/*:string*/, _opts, _nfm)/*:Workbook*/ {
 							for(var rpt = 0; rpt < rowpeat; ++rpt) {
 								colpeat = parseInt(ctag['number-columns-repeated']||"1", 10);
 								if(opts.dense) {
-									if(!ws["!data"][R + rpt]) ws["!data"][R + rpt] = [];
-									ws["!data"][R + rpt][C] = rpt == 0 ? q : dup(q);
-									while(--colpeat > 0) ws["!data"][R + rpt][C + colpeat] = dup(q);
+									if(!ws[R + rpt]) ws[R + rpt] = [];
+									ws[R + rpt][C] = rpt == 0 ? q : dup(q);
+									while(--colpeat > 0) ws[R + rpt][C + colpeat] = dup(q);
 								} else {
 									ws[encode_cell({r:R + rpt,c:C})] = q;
 									while(--colpeat > 0) ws[encode_cell({r:R + rpt,c:C + colpeat})] = dup(q);
@ -446,17 +443,10 @@ function parse_content_xml(d/*:string*/, _opts, _nfm)/*:Workbook*/ {
 					if(textR.length) /*::(*/comment/*:: :any)*/.R = textR;
 					comment.a = creator;
 					comments.push(comment);
-					textp = oldtextp; textpidx = oldtextpidx; textR = oldtextR;
-				}
-				else if(Rn[0].charAt(Rn[0].length-2) !== '/') {
-					state.push([Rn[3], false]);
-					var annotag = parsexmltag(Rn[0], true);
-					/* office:display TODO: check if there is a global override */
-					if(!(annotag["display"] && parsexmlbool(annotag["display"]))) comments.hidden = true;
-					oldtextp = textp; oldtextpidx = textpidx; oldtextR = textR;
-					textp = ""; textpidx = 0; textR = [];
 				}
+				else if(Rn[0].charAt(Rn[0].length-2) !== '/') {state.push([Rn[3], false]);}
 				creator = ""; creatoridx = 0;
+				textp = ""; textpidx = 0; textR = [];
 				break;

 			case 'creator': // 4.3.2.7 <dc:creator>
@ -582,7 +572,9 @@ function parse_content_xml(d/*:string*/, _opts, _nfm)/*:Workbook*/ {
 			case 'null-date': // 9.4.2 <table:null-date>
 				tag = parsexmltag(Rn[0], false);
 				switch(tag["date-value"]) {
-					case "1904-01-01": WB.WBProps.date1904 = true; break;
+					case "1904-01-01": WB.WBProps.date1904 = true;
+					/* falls through */
+					case "1900-01-01": baddate = 0;
 				}
 				break;

@ -604,9 +596,6 @@ function parse_content_xml(d/*:string*/, _opts, _nfm)/*:Workbook*/ {
 				if(Rn[1]==='/' && (!ctag || !ctag['string-value'])) {
 					var ptp = parse_text_p(str.slice(textpidx,Rn.index), textptag);
 					textp = (textp.length > 0 ? textp + "\n" : "") + ptp[0];
-				} else if(Rn[0].slice(-2) == "/>") {
-					/* TODO: is self-closing 文本串 valid? */
-					textp += "\n";
 				} else { textptag = parsexmltag(Rn[0], false); textpidx = Rn.index + Rn[0].length; }
 				break; // <text:p>
 			case 's': break; // <text:s>
@ -636,13 +625,10 @@ function parse_content_xml(d/*:string*/, _opts, _nfm)/*:Workbook*/ {
 			case 'help-message': break; // 9.4.6 <table:
 			case 'error-message': break; // 9.4.7 <table:
 			case 'database-ranges': break; // 9.4.14 <table:database-ranges>
-
-			/* 9.5 Filters */
 			case 'filter': break; // 9.5.2 <table:filter>
 			case 'filter-and': break; // 9.5.3 <table:filter-and>
 			case 'filter-or': break; // 9.5.4 <table:filter-or>
 			case 'filter-condition': break; // 9.5.5 <table:filter-condition>
-			case 'filter-set-item': break; // 9.5.6 <table:filter-condition>

 			case 'list-level-style-bullet': break; // 16.31 <text:
 			case 'list-level-style-number': break; // 16.32 <text:
--- a/bits/81_writeods.js
+++ b/bits/81_writeods.js
@ -99,9 +99,7 @@ function write_number_format_ods(nf/*:string*/, nfidx/*:string*/)/*:string*/ {
 					while(nf[++i] != '"' || nf[++i] == '"') c += nf[i]; --i;
 					payload += '<number:text>' + escapexml(c.slice(1).replace(/""/g, '"')) + '</number:text>';
 					break;
-				case '\\': c = nf[++i];
-					payload += '<number:text>' + escapexml(c) + '</number:text>'; break;
-				case '/': case ':': payload += '<number:text>' + escapexml(c) + '</number:text>'; break;
+				case '/': payload += '<number:text>' + escapexml(c) + '</number:text>'; break;
 				default: console.error("unrecognized character " + c + " in ODF format " + nf);
 			}
 			if(!has_time) break j;
@ -128,7 +126,7 @@ function write_number_format_ods(nf/*:string*/, nfidx/*:string*/)/*:string*/ {
 					while(nf[++i] != '"' || nf[++i] == '"') c += nf[i]; --i;
 					payload += '<number:text>' + escapexml(c.slice(1).replace(/""/g, '"')) + '</number:text>';
 					break;
-				case '/': case ':': payload += '<number:text>' + escapexml(c) + '</number:text>'; break;
+				case '/': payload += '<number:text>' + escapexml(c) + '</number:text>'; break;
 				case "a":
 					if(nf.slice(i, i+3).toLowerCase() == "a/p") { payload += '<number:am-pm/>'; i += 2; break; } // Note: ODF does not support A/P
 					if(nf.slice(i, i+5).toLowerCase() == "am/pm")  { payload += '<number:am-pm/>'; i += 4; break; }
@ -184,15 +182,10 @@ function write_number_format_ods(nf/*:string*/, nfidx/*:string*/)/*:string*/ {
 }

 function write_names_ods(Names, SheetNames, idx) {
-	//var scoped = Names.filter(function(name) { return name.Sheet == (idx == -1 ? null : idx); });
-	var scoped = []; for(var namei = 0; namei < Names.length; ++namei) {
-		var name = Names[namei];
-		if(!name) continue;
-		if(name.Sheet == (idx == -1 ? null : idx)) scoped.push(name);
-	}
+	var scoped = Names.filter(function(name) { return name.Sheet == (idx == -1 ? null : idx); });
 	if(!scoped.length) return "";
 	return "      <table:named-expressions>\n" + scoped.map(function(name) {
-		var odsref =  (idx == -1 ? "$" : "") + csf_to_ods_3D(name.Ref);
+		var odsref =  csf_to_ods_3D(name.Ref);
 		return "        " + writextag("table:named-range", null, {
 			"table:name": name.Name,
 			"table:cell-range-address": odsref,
@ -211,13 +204,14 @@ var write_content_ods/*:{(wb:any, opts:any):string}*/ = /* @__PURE__ */(function
 	};

 	var null_cell_xml = '          <table:table-cell />\n';
-	var write_ws = function(ws, wb/*:Workbook*/, i/*:number*/, opts, nfs, date1904)/*:string*/ {
+	var covered_cell_xml = '          <table:covered-table-cell/>\n';
+	var write_ws = function(ws, wb/*:Workbook*/, i/*:number*/, opts, nfs)/*:string*/ {
 		/* Section 9 Tables */
 		var o/*:Array<string>*/ = [];
 		o.push('      <table:table table:name="' + escapexml(wb.SheetNames[i]) + '" table:style-name="ta1">\n');
 		var R=0,C=0, range = decode_range(ws['!ref']||"A1");
 		var marr/*:Array<Range>*/ = ws['!merges'] || [], mi = 0;
-		var dense = ws["!data"] != null;
+		var dense = Array.isArray(ws);
 		if(ws["!cols"]) {
 			for(C = 0; C <= range.e.c; ++C) o.push('        <table:table-column' + (ws["!cols"][C] ? ' table:style-name="co' + ws["!cols"][C].ods + '"' : '') + '></table:table-column>\n');
 		}
@ -242,8 +236,8 @@ var write_content_ods/*:{(wb:any, opts:any):string}*/ = /* @__PURE__ */(function
 					ct['table:number-rows-spanned'] =    (marr[mi].e.r - marr[mi].s.r + 1);
 					break;
 				}
-				if(skip) { o.push('          <table:covered-table-cell/>\n'); continue; }
-				var ref = encode_cell({r:R, c:C}), cell = dense ? (ws["!data"][R]||[])[C]: ws[ref];
+				if(skip) { o.push(covered_cell_xml); continue; }
+				var ref = encode_cell({r:R, c:C}), cell = dense ? (ws[R]||[])[C]: ws[ref];
 				if(cell && cell.f) {
 					ct['table:formula'] = escapexml(csf_to_ods_formula(cell.f));
 					if(cell.F) {
@ -271,13 +265,13 @@ var write_content_ods/*:{(wb:any, opts:any):string}*/ = /* @__PURE__ */(function
 						ct['office:value-type'] = "string";
 						break;
 					case 'd':
-						textp = (cell.w||(parseDate(cell.v, date1904).toISOString()));
+						textp = (cell.w||(parseDate(cell.v).toISOString()));
 						ct['office:value-type'] = "date";
-						ct['office:date-value'] = (parseDate(cell.v, date1904).toISOString());
+						ct['office:date-value'] = (parseDate(cell.v).toISOString());
 						ct['table:style-name'] = "ce1";
 						break;
-					//case 'e': // TODO: translate to ODS errors
-					default: o.push(null_cell_xml); continue; // TODO: empty cell with comments
+					//case 'e':
+					default: o.push(null_cell_xml); continue;
 				}
 				var text_p = write_text_p(textp);
 				if(cell.l && cell.l.Target) {
@ -288,17 +282,7 @@ var write_content_ods/*:{(wb:any, opts:any):string}*/ = /* @__PURE__ */(function
 					text_p = writextag('text:a', text_p, {'xlink:href': _tgt.replace(/&/g, "&amp;")});
 				}
 				if(nfs[cell.z]) ct["table:style-name"] = "ce" + nfs[cell.z].slice(1);
-				var payload = writextag('text:p', text_p, {});
-				if(cell.c) {
-					var acreator = "", apayload = "", aprops = {};
-					for(var ci = 0; ci < cell.c.length; ++ci) {
-						if(!acreator && cell.c[ci].a) acreator = cell.c[ci].a;
-						apayload += "<text:p>" + write_text_p(cell.c[ci].t) + "</text:p>";
-					}
-					if(!cell.c.hidden) aprops["office:display"] = true;
-					payload = writextag('office:annotation', apayload, aprops) + payload;
-				}
-				o.push('          ' + writextag('table:table-cell', payload, ct) + '\n');
+				o.push('          ' + writextag('table:table-cell', writextag('text:p', text_p, {}), ct) + '\n');
 			}
 			o.push('        </table:table-row>\n');
 		}
@ -363,11 +347,9 @@ var write_content_ods/*:{(wb:any, opts:any):string}*/ = /* @__PURE__ */(function
 		var nfi = 69;
 		wb.SheetNames.map(function(n) { return wb.Sheets[n]; }).forEach(function(ws) {
 			if(!ws) return;
-			var dense = (ws["!data"] != null);
-			if(!ws["!ref"]) return;
 			var range = decode_range(ws["!ref"]);
 			for(var R = 0; R <= range.e.r; ++R) for(var C = 0; C <= range.e.c; ++C) {
-				var c = dense ? (ws["!data"][R]||[])[C] : ws[encode_cell({r:R,c:C})];
+				var c = Array.isArray(ws) ? (ws[R]||[])[C] : ws[encode_cell({r:R,c:C})];
 				if(!c || !c.z || c.z.toLowerCase() == "general") continue;
 				if(!nfs[c.z]) {
 					var out = write_number_format_ods(c.z, "N" + nfi);
@ -444,7 +426,7 @@ var write_content_ods/*:{(wb:any, opts:any):string}*/ = /* @__PURE__ */(function
 		o.push('  <office:body>\n');
 		o.push('    <office:spreadsheet>\n');
 		if(((wb.Workbook||{}).WBProps||{}).date1904) o.push('      <table:calculation-settings table:case-sensitive="false" table:search-criteria-must-apply-to-whole-cell="true" table:use-wildcards="true" table:use-regular-expressions="false" table:automatic-find-labels="false">\n        <table:null-date table:date-value="1904-01-01"/>\n      </table:calculation-settings>\n');
-		for(var i = 0; i != wb.SheetNames.length; ++i) o.push(write_ws(wb.Sheets[wb.SheetNames[i]], wb, i, opts, nfs, ((wb.Workbook||{}).WBProps||{}).date1904));
+		for(var i = 0; i != wb.SheetNames.length; ++i) o.push(write_ws(wb.Sheets[wb.SheetNames[i]], wb, i, opts, nfs));
 		if((wb.Workbook||{}).Names) o.push(write_names_ods(wb.Workbook.Names, wb.SheetNames, -1));
 		o.push('    </office:spreadsheet>\n');
 		o.push('  </office:body>\n');
--- a/bits/83_numbers.js
+++ b/bits/83_numbers.js
--- a/bits/85_parsezip.js
+++ b/bits/85_parsezip.js
@ -13,13 +13,6 @@ function safe_parse_wbrels(wbrels, sheets) {
 	return !wbrels || wbrels.length === 0 ? null : wbrels;
 }

-function parse_sheet_legacy_drawing(sheet, type, zip, path, idx, opts, wb, comments) {
-	if(!sheet || !sheet['!legdrawel']) return;
-	var dfile = resolve_path(sheet['!legdrawel'].Target, path);
-	var draw = getzipstr(zip, dfile, true);
-	if(draw) parse_vml(utf8read(draw), sheet, comments||[]);
-}
-
 function safe_parse_sheet(zip, path/*:string*/, relsPath/*:string*/, sheet, idx/*:number*/, sheetRels, sheets, stype/*:string*/, opts, wb, themes, styles) {
 	try {
 		sheetRels[sheet]=parse_rels(getzipstr(zip, relsPath, true), path);
@ -43,12 +36,12 @@ function safe_parse_sheet(zip, path/*:string*/, relsPath/*:string*/, sheet, idx/
 		sheets[sheet] = _ws;

 		/* scan rels for comments and threaded comments */
-		var comments = [], tcomments = [];
+		var tcomments = [];
 		if(sheetRels && sheetRels[sheet]) keys(sheetRels[sheet]).forEach(function(n) {
 			var dfile = "";
 			if(sheetRels[sheet][n].Type == RELS.CMNT) {
 				dfile = resolve_path(sheetRels[sheet][n].Target, path);
-				comments = parse_cmnt(getzipdata(zip, dfile, true), dfile, opts);
+				var comments = parse_cmnt(getzipdata(zip, dfile, true), dfile, opts);
 				if(!comments || !comments.length) return;
 				sheet_insert_comments(_ws, comments, false);
 			}
@ -58,7 +51,6 @@ function safe_parse_sheet(zip, path/*:string*/, relsPath/*:string*/, sheet, idx/
 			}
 		});
 		if(tcomments && tcomments.length) sheet_insert_comments(_ws, tcomments, true, opts.people || []);
-		parse_sheet_legacy_drawing(_ws, stype, zip, path, idx, opts, wb, comments);
 	} catch(e) { if(opts.WTF) throw e; }
 }

--- a/bits/86_writezip.js
+++ b/bits/86_writezip.js
@ -51,9 +51,6 @@ function write_zip_xlsb(wb/*:Workbook*/, opts/*:WriteOpts*/)/*:ZIP*/ {
 		add_rels(opts.rels, 4, f, RELS.CUST_PROPS);
 	}

-	var people = ["SheetJ5"];
-	opts.tcid = 0;
-
 	for(rId=1;rId <= wb.SheetNames.length; ++rId) {
 		var wsrels = {'!id':{}};
 		var ws = wb.Sheets[wb.SheetNames[rId-1]];
@ -73,17 +70,6 @@ function write_zip_xlsb(wb/*:Workbook*/, opts/*:WriteOpts*/)/*:ZIP*/ {
 			var need_vml = false;
 			var cf = "";
 			if(comments && comments.length > 0) {
-				var needtc = false;
-				comments.forEach(function(carr) {
-					carr[1].forEach(function(c) { if(c.T == true) needtc = true; });
-				});
-				if(needtc) {
-					cf = "xl/threadedComments/threadedComment" + rId + ".xml";
-					zip_add_file(zip, cf, write_tcmnt_xml(comments, people, opts));
-					ct.threadedcomments.push(cf);
-					add_rels(wsrels, -1, "../threadedComments/threadedComment" + rId + ".xml", RELS.TCMNT);
-				}
-
 				cf = "xl/comments" + rId + "." + wbext;
 				zip_add_file(zip, cf, write_comments_bin(comments, opts));
 				ct.comments.push(cf);
@ -115,8 +101,7 @@ function write_zip_xlsb(wb/*:Workbook*/, opts/*:WriteOpts*/)/*:ZIP*/ {
 	/* TODO: something more intelligent with themes */

 	f = "xl/theme/theme1.xml";
-	var ww = write_theme(wb.Themes, opts);
-	zip_add_file(zip, f, ww);
+	zip_add_file(zip, f, write_theme(wb.Themes, opts));
 	ct.themes.push(f);
 	add_rels(opts.wbrels, -1, "theme/theme1.xml", RELS.THEME);

@ -139,13 +124,6 @@ function write_zip_xlsb(wb/*:Workbook*/, opts/*:WriteOpts*/)/*:ZIP*/ {
 	ct.metadata.push(f);
 	add_rels(opts.wbrels, -1, "metadata." + wbext, RELS.XLMETA);

-	if(people.length > 1) {
-		f = "xl/persons/person.xml";
-		zip_add_file(zip, f, write_people_xml(people, opts));
-		ct.people.push(f);
-		add_rels(opts.wbrels, -1, "persons/person.xml", RELS.PEOPLE);
-	}
-
 	zip_add_file(zip, "[Content_Types].xml", write_ct(ct, opts));
 	zip_add_file(zip, '_rels/.rels', write_rels(opts.rels));
 	zip_add_file(zip, 'xl/_rels/workbook.' + wbext + '.rels', write_rels(opts.wbrels));
--- a/bits/87_read.js
+++ b/bits/87_read.js
@ -50,13 +50,7 @@ function read_plaintext_raw(data/*:RawData*/, o/*:ParseOpts*/)/*:Workbook*/ {
 function read_utf16(data/*:RawData*/, o/*:ParseOpts*/)/*:Workbook*/ {
 	var d = data;
 	if(o.type == 'base64') d = Base64_decode(d);
-	if(typeof ArrayBuffer !== "undefined" && data instanceof ArrayBuffer) d = new Uint8Array(data);
-	d = typeof $cptable !== "undefined" ? $cptable.utils.decode(1200, d.slice(2), 'str') : (
-		(has_buf && Buffer.isBuffer(data)) ? data.slice(2).toString("utf16le") :
-		(typeof Uint8Array !== "undefined" && d instanceof Uint8Array) ? (
-			typeof TextDecoder !== "undefined" ? new TextDecoder("utf-16le").decode(d.slice(2)) : utf16lereadu(d.slice(2))
-		) : utf16leread(d.slice(2))
-	);
+	d = typeof $cptable !== "undefined" ? $cptable.utils.decode(1200, d.slice(2), 'str') : utf16leread(d.slice(2));
 	o.type = "binary";
 	return read_plaintext(d, o);
 }
--- a/bits/90_utils.js
+++ b/bits/90_utils.js
@ -4,18 +4,18 @@ type MJRObject = {
 	isempty: boolean;
 };
 */
-function make_json_row(sheet/*:Worksheet*/, r/*:Range*/, R/*:number*/, cols/*:Array<string>*/, header/*:number*/, hdr/*:Array<any>*/, o/*:Sheet2JSONOpts*/)/*:MJRObject*/ {
+function make_json_row(sheet/*:Worksheet*/, r/*:Range*/, R/*:number*/, cols/*:Array<string>*/, header/*:number*/, hdr/*:Array<any>*/, dense/*:boolean*/, o/*:Sheet2JSONOpts*/)/*:MJRObject*/ {
 	var rr = encode_row(R);
 	var defval = o.defval, raw = o.raw || !Object.prototype.hasOwnProperty.call(o, "raw");
-	var isempty = true, dense = (sheet["!data"] != null);
+	var isempty = true;
 	var row/*:any*/ = (header === 1) ? [] : {};
 	if(header !== 1) {
 		if(Object.defineProperty) try { Object.defineProperty(row, '__rowNum__', {value:R, enumerable:false}); } catch(e) { row.__rowNum__ = R; }
 		else row.__rowNum__ = R;
 	}
-	if(!dense || sheet["!data"][R]) for (var C = r.s.c; C <= r.e.c; ++C) {
-		var val = dense ? (sheet["!data"][R]||[])[C] : sheet[cols[C] + rr];
-		if(val == null || val.t === undefined) {
+	if(!dense || sheet[R]) for (var C = r.s.c; C <= r.e.c; ++C) {
+		var val = dense ? sheet[R][C] : sheet[cols[C] + rr];
+		if(val === undefined || val.t === undefined) {
 			if(defval === undefined) continue;
 			if(hdr[C] != null) { row[hdr[C]] = defval; }
 			continue;
@ -24,12 +24,7 @@ function make_json_row(sheet/*:Worksheet*/, r/*:Range*/, R/*:number*/, cols/*:Ar
 		switch(val.t){
 			case 'z': if(v == null) break; continue;
 			case 'e': v = (v == 0 ? null : void 0); break;
-			case 's': case 'b':
-			case 'n': if(!val.z || !fmt_is_date(val.z)) break;
-			v = numdate(v); // TODO: date1904 setting should also be stored in worksheet object
-			if(typeof v == "number") break;
-			/* falls through */
-			case 'd': if(!(o && o.UTC)) v = utc_to_local(v); break;
+			case 's': case 'd': case 'b': case 'n': break;
 			default: throw new Error('unrecognized type ' + val.t);
 		}
 		if(hdr[C] != null) {
@ -39,7 +34,7 @@ function make_json_row(sheet/*:Worksheet*/, r/*:Range*/, R/*:number*/, cols/*:Ar
 				else if(raw && v === null) row[hdr[C]] = null;
 				else continue;
 			} else {
-				row[hdr[C]] = (val.t === 'n' && typeof o.rawNumbers === 'boolean' ? o.rawNumbers : raw) ? v : format_cell(val, v, o);
+				row[hdr[C]] = raw && (val.t !== "n" || (val.t === "n" && o.rawNumbers !== false)) ? v : format_cell(val,v,o);
 			}
 			if(v != null) isempty = false;
 		}
@ -68,16 +63,16 @@ function sheet_to_json(sheet/*:Worksheet*/, opts/*:?Sheet2JSONOpts*/) {
 	var cols/*:Array<string>*/ = [];
 	var out/*:Array<any>*/ = [];
 	var outi = 0, counter = 0;
-	var dense = sheet["!data"] != null;
+	var dense = Array.isArray(sheet);
 	var R = r.s.r, C = 0;
 	var header_cnt = {};
-	if(dense && !sheet["!data"][R]) sheet["!data"][R] = [];
+	if(dense && !sheet[R]) sheet[R] = [];
 	var colinfo/*:Array<ColInfo>*/ = o.skipHidden && sheet["!cols"] || [];
 	var rowinfo/*:Array<ColInfo>*/ = o.skipHidden && sheet["!rows"] || [];
 	for(C = r.s.c; C <= r.e.c; ++C) {
 		if(((colinfo[C]||{}).hidden)) continue;
 		cols[C] = encode_col(C);
-		val = dense ? sheet["!data"][R][C] : sheet[cols[C] + rr];
+		val = dense ? sheet[R][C] : sheet[cols[C] + rr];
 		switch(header) {
 			case 1: hdr[C] = C - r.s.c; break;
 			case 2: hdr[C] = cols[C]; break;
@ -96,7 +91,7 @@ function sheet_to_json(sheet/*:Worksheet*/, opts/*:?Sheet2JSONOpts*/) {
 	}
 	for (R = r.s.r + offset; R <= r.e.r; ++R) {
 		if ((rowinfo[R]||{}).hidden) continue;
-		var row = make_json_row(sheet, r, R, cols, header, hdr, o);
+		var row = make_json_row(sheet, r, R, cols, header, hdr, dense, o);
 		if((row.isempty === false) || (header === 1 ? o.blankrows !== false : !!o.blankrows)) out[outi++] = row.row;
 	}
 	out.length = outi;
@ -107,11 +102,9 @@ var qreg = /"/g;
 function make_csv_row(sheet/*:Worksheet*/, r/*:Range*/, R/*:number*/, cols/*:Array<string>*/, fs/*:number*/, rs/*:number*/, FS/*:string*/, o/*:Sheet2CSVOpts*/)/*:?string*/ {
 	var isempty = true;
 	var row/*:Array<string>*/ = [], txt = "", rr = encode_row(R);
-	var dense = sheet["!data"] != null;
-	var datarow = dense && sheet["!data"][R] || [];
 	for(var C = r.s.c; C <= r.e.c; ++C) {
 		if (!cols[C]) continue;
-		var val = dense ? datarow[C]: sheet[cols[C] + rr];
+		var val = o.dense ? (sheet[R]||[])[C]: sheet[cols[C] + rr];
 		if(val == null) txt = "";
 		else if(val.v != null) {
 			isempty = false;
@ -138,6 +131,7 @@ function sheet_to_csv(sheet/*:Worksheet*/, opts/*:?Sheet2CSVOpts*/)/*:string*/ {
 	var RS = o.RS !== undefined ? o.RS : "\n", rs = RS.charCodeAt(0);
 	var endregex = new RegExp((FS=="|" ? "\\|" : FS)+"+$");
 	var row = "", cols/*:Array<string>*/ = [];
+	o.dense = Array.isArray(sheet);
 	var colinfo/*:Array<ColInfo>*/ = o.skipHidden && sheet["!cols"] || [];
 	var rowinfo/*:Array<ColInfo>*/ = o.skipHidden && sheet["!rows"] || [];
 	for(var C = r.s.c; C <= r.e.c; ++C) if (!((colinfo[C]||{}).hidden)) cols[C] = encode_col(C);
@ -149,6 +143,7 @@ function sheet_to_csv(sheet/*:Worksheet*/, opts/*:?Sheet2CSVOpts*/)/*:string*/ {
 		if(o.strip) row = row.replace(endregex,"");
 		if(row || (o.blankrows !== false)) out.push((w++ ? RS : "") + row);
 	}
+	delete o.dense;
 	return out.join("");
 }

@ -165,13 +160,13 @@ function sheet_to_formulae(sheet/*:Worksheet*/)/*:Array<string>*/ {
 	if(sheet == null || sheet["!ref"] == null) return [];
 	var r = safe_decode_range(sheet['!ref']), rr = "", cols/*:Array<string>*/ = [], C;
 	var cmds/*:Array<string>*/ = [];
-	var dense = sheet["!data"] != null;
+	var dense = Array.isArray(sheet);
 	for(C = r.s.c; C <= r.e.c; ++C) cols[C] = encode_col(C);
 	for(var R = r.s.r; R <= r.e.r; ++R) {
 		rr = encode_row(R);
 		for(C = r.s.c; C <= r.e.c; ++C) {
 			y = cols[C] + rr;
-			x = dense ? (sheet["!data"][R]||[])[C] : sheet[y];
+			x = dense ? (sheet[R]||[])[C] : sheet[y];
 			val = "";
 			if(x === undefined) continue;
 			else if(x.F != null) {
@ -196,11 +191,10 @@ function sheet_to_formulae(sheet/*:Worksheet*/)/*:Array<string>*/ {

 function sheet_add_json(_ws/*:?Worksheet*/, js/*:Array<any>*/, opts)/*:Worksheet*/ {
 	var o = opts || {};
-	var dense = _ws ? (_ws["!data"] != null) : o.dense;
+	var dense = _ws ? Array.isArray(_ws) : o.dense;
 	if(DENSE != null && dense == null) dense = DENSE;
 	var offset = +!o.skipHeader;
-	var ws/*:Worksheet*/ = _ws || ({});
-	if(!_ws && dense) ws["!data"] = [];
+	var ws/*:Worksheet*/ = _ws || (dense ? ([]/*:any*/) : ({}/*:any*/));
 	var _R = 0, _C = 0;
 	if(ws && o.origin != null) {
 		if(typeof o.origin == 'number') _R = o.origin;
@ -219,27 +213,25 @@ function sheet_add_json(_ws/*:?Worksheet*/, js/*:Array<any>*/, opts)/*:Worksheet
 		if(_R == -1) { _R = 0; range.e.r = js.length - 1 + offset; }
 	}
 	var hdr/*:Array<string>*/ = o.header || [], C = 0;
-	var ROW = [];
+
 	js.forEach(function (JS, R/*:number*/) {
-		if(dense && !ws["!data"][_R + R + offset]) ws["!data"][_R + R + offset] = [];
-		if(dense) ROW = ws["!data"][_R + R + offset];
+		if(!ws[_R + R + offset]) ws[_R + R + offset] = [];
+		var ROW = ws[_R + R + offset];
 		keys(JS).forEach(function(k) {
 			if((C=hdr.indexOf(k)) == -1) hdr[C=hdr.length] = k;
 			var v = JS[k];
 			var t = 'z';
 			var z = "";
-			var ref = dense ? "" : (encode_col(_C + C) + encode_row(_R + R + offset));
+			var ref = dense ? "" : encode_cell({c:_C + C,r:_R + R + offset});
 			var cell/*:Cell*/ = dense ? ROW[_C + C] : ws[ref];
 			if(v && typeof v === 'object' && !(v instanceof Date)){
-				if(dense) ROW[_C + C] = v;
-				else ws[ref] = v;
+				ws[ref] = v;
 			} else {
 				if(typeof v == 'number') t = 'n';
 				else if(typeof v == 'boolean') t = 'b';
 				else if(typeof v == 'string') t = 's';
 				else if(v instanceof Date) {
 					t = 'd';
-					if(!o.UTC) v = local_to_utc(v);
 					if(!o.cellDates) { t = 'n'; v = datenum(v); }
 					z = (cell != null && cell.z && fmt_is_date(cell.z)) ? cell.z : (o.dateNF || table_fmt[14]);
 				}
@ -247,7 +239,8 @@ function sheet_add_json(_ws/*:?Worksheet*/, js/*:Array<any>*/, opts)/*:Worksheet
 				if(!cell) {
 					if(!dense) ws[ref] = cell = ({t:t, v:v}/*:any*/);
 					else ROW[_C + C] = cell = ({t:t, v:v}/*:any*/);
-				} else {
+				}
+				else {
 					cell.t = t; cell.v = v;
 					delete cell.w; delete cell.R;
 					if(z) cell.z = z;
@ -258,9 +251,9 @@ function sheet_add_json(_ws/*:?Worksheet*/, js/*:Array<any>*/, opts)/*:Worksheet
 	});
 	range.e.c = Math.max(range.e.c, _C + hdr.length - 1);
 	var __R = encode_row(_R);
-	if(dense && !ws["!data"][_R]) ws["!data"][_R] = [];
+	if(dense && !ws[_R]) ws[_R] = [];
 	if(offset) for(C = 0; C < hdr.length; ++C) {
-		if(dense) ws["!data"][_R][C + _C] = {t:'s', v:hdr[C]};
+		if(dense) ws[_R][C + _C] = {t:'s', v:hdr[C]};
 		else ws[encode_col(C + _C) + __R] = {t:'s', v:hdr[C]};
 	}
 	ws['!ref'] = encode_range(range);
@ -272,17 +265,18 @@ function json_to_sheet(js/*:Array<any>*/, opts)/*:Worksheet*/ { return sheet_add
 function ws_get_cell_stub(ws/*:Worksheet*/, R, C/*:?number*/)/*:Cell*/ {
 	/* A1 cell address */
 	if(typeof R == "string") {
-		if(ws["!data"] != null) {
+		/* dense */
+		if(Array.isArray(ws)) {
 			var RC = decode_cell(R);
-			if(!ws["!data"][RC.r]) ws["!data"][RC.r] = [];
-			return ws["!data"][RC.r][RC.c] || (ws["!data"][RC.r][RC.c] = {t:'z'});
+			if(!ws[RC.r]) ws[RC.r] = [];
+			return ws[RC.r][RC.c] || (ws[RC.r][RC.c] = {t:'z'});
 		}
 		return ws[R] || (ws[R] = {t:'z'});
 	}
 	/* cell address object */
 	if(typeof R != "number") return ws_get_cell_stub(ws, encode_cell(R));
 	/* R and C are 0-based indices */
-	return ws_get_cell_stub(ws, encode_col(C||0) + encode_row(R));
+	return ws_get_cell_stub(ws, encode_cell({r:R,c:C||0}));
 }

 /* find sheet index for given name / validate index */
@ -297,11 +291,9 @@ function wb_sheet_idx(wb/*:Workbook*/, sh/*:number|string*/) {
 	} else throw new Error("Cannot find sheet |" + sh + "|");
 }

-/* simple blank or single-sheet workbook object */
-function book_new(ws/*:?Worksheet*/, wsname/*:?string*/)/*:Workbook*/ {
-	var wb = { SheetNames: [], Sheets: {} };
-	if(ws) book_append_sheet(wb, ws, wsname || "Sheet1");
-	return wb;
+/* simple blank workbook object */
+function book_new()/*:Workbook*/ {
+	return { SheetNames: [], Sheets: {} };
 }

 /* add a worksheet to the end of a given workbook */
--- a/bits/95_api.js
+++ b/bits/95_api.js
@ -9,7 +9,6 @@ var utils/*:any*/ = {
 	decode_cell: decode_cell,
 	decode_range: decode_range,
 	format_cell: format_cell,
-	sheet_new: sheet_new,
 	sheet_add_aoa: sheet_add_aoa,
 	sheet_add_json: sheet_add_json,
 	sheet_add_dom: sheet_add_dom,
--- a/bits/97_node.js
+++ b/bits/97_node.js
@ -10,6 +10,7 @@ function write_csv_stream(sheet/*:Worksheet*/, opts/*:?Sheet2CSVOpts*/) {
 	var RS = o.RS !== undefined ? o.RS : "\n", rs = RS.charCodeAt(0);
 	var endregex = new RegExp((FS=="|" ? "\\|" : FS)+"+$");
 	var row/*:?string*/ = "", cols/*:Array<string>*/ = [];
+	o.dense = Array.isArray(sheet);
 	var colinfo/*:Array<ColInfo>*/ = o.skipHidden && sheet["!cols"] || [];
 	var rowinfo/*:Array<RowInfo>*/ = o.skipHidden && sheet["!rows"] || [];
 	for(var C = r.s.c; C <= r.e.c; ++C) if (!((colinfo[C]||{}).hidden)) cols[C] = encode_col(C);
@ -39,6 +40,7 @@ function write_html_stream(ws/*:Worksheet*/, opts/*:?Sheet2HTMLOpts*/) {
 	var footer = o.footer != null ? o.footer : HTML_END;
 	stream.push(header);
 	var r = decode_range(ws['!ref']);
+	o.dense = Array.isArray(ws);
 	stream.push(make_html_preamble(ws, r, o));
 	var R = r.s.r;
 	var end = false;
@ -76,16 +78,16 @@ function write_json_stream(sheet/*:Worksheet*/, opts/*:?Sheet2CSVOpts*/) {
 	var rr = encode_row(r.s.r);
 	var cols/*:Array<string>*/ = [];
 	var counter = 0;
-	var dense = sheet["!data"] != null;
+	var dense = Array.isArray(sheet);
 	var R = r.s.r, C = 0;
 	var header_cnt = {};
-	if(dense && !sheet["!data"][R]) sheet["!data"][R] = [];
+	if(dense && !sheet[R]) sheet[R] = [];
 	var colinfo/*:Array<ColInfo>*/ = o.skipHidden && sheet["!cols"] || [];
 	var rowinfo/*:Array<RowInfo>*/ = o.skipHidden && sheet["!rows"] || [];
 	for(C = r.s.c; C <= r.e.c; ++C) {
 		if(((colinfo[C]||{}).hidden)) continue;
 		cols[C] = encode_col(C);
-		val = dense ? sheet["!data"][R][C] : sheet[cols[C] + rr];
+		val = dense ? sheet[R][C] : sheet[cols[C] + rr];
 		switch(header) {
 			case 1: hdr[C] = C - r.s.c; break;
 			case 2: hdr[C] = cols[C]; break;
@ -106,7 +108,7 @@ function write_json_stream(sheet/*:Worksheet*/, opts/*:?Sheet2CSVOpts*/) {
 	stream._read = function() {
 		while(R <= r.e.r) {
 			if ((rowinfo[R-1]||{}).hidden) continue;
-			var row = make_json_row(sheet, r, R, cols, header, hdr, o);
+			var row = make_json_row(sheet, r, R, cols, header, hdr, dense, o);
 			++R;
 			if((row.isempty === false) || (header === 1 ? o.blankrows !== false : !!o.blankrows)) {
 				stream.push(row.row);
--- a/bits/98_exports.js
+++ b/bits/98_exports.js
@ -10,8 +10,6 @@ XLSX.writeFileAsync = writeFileAsync;
 XLSX.utils = utils;
 XLSX.writeXLSX = writeSyncXLSX;
 XLSX.writeFileXLSX = writeFileSyncXLSX;
-XLSX.set_fs = set_fs;
-XLSX.set_cptable = set_cptable;
 XLSX.SSF = SSF;
 if(typeof __stream !== "undefined") XLSX.stream = __stream;
 if(typeof CFB !== "undefined") XLSX.CFB = CFB;
--- a/demos/README.md
+++ b/demos/README.md
@ -0,0 +1,78 @@
+# Demos
+
+These demos are intended to demonstrate how to load this library in various
+ecosystems.  The library is designed to be used in the web browser and in node
+contexts, using dynamic feature tests to pull in features when necessary.  This
+works extremely well in common use cases: script tag insertion and node require.
+
+Systems like webpack try to be clever by performing simple static analysis to
+pull in code.  However, they do not support dynamic type tests, breaking
+compatibility with traditional scripts.  Configuration is required.  The demos
+cover basic configuration steps for various systems and should "just work".
+
+Mobile app and other larger demos do not include the full build structure. The
+demos have `Makefile` scripts that show how to reproduce the full projects.  The
+scripts have been tested against iOS and OSX.  For Windows platforms, GNU make
+can be installed with Bash on Windows or with `cygwin`.
+
+### Included Demos
+
+**JavaScript APIs**
+- [`XMLHttpRequest and fetch`](https://docs.sheetjs.com/docs/demos/network)
+- [`Clipboard Data`](https://docs.sheetjs.com/docs/demos/clipboard)
+- [`Typed Arrays for Machine Learning`](https://docs.sheetjs.com/docs/demos/ml)
+- [`LocalStorage and SessionStorage`](https://docs.sheetjs.com/docs/demos/database#localstorage-and-sessionstorage)
+- [`Web SQL Database`](https://docs.sheetjs.com/docs/demos/database#websql)
+- [`IndexedDB`](https://docs.sheetjs.com/docs/demos/database#indexeddb)
+
+**Frameworks**
+- [`Angular 2+ and Ionic`](https://docs.sheetjs.com/docs/demos/angular)
+- [`React`](https://docs.sheetjs.com/docs/demos/react)
+- [`VueJS`](https://docs.sheetjs.com/docs/demos/vue)
+- [`Angular.JS`](https://docs.sheetjs.com/docs/demos/legacy#angularjs)
+- [`Knockout`](https://docs.sheetjs.com/docs/demos/legacy#knockoutjs)
+
+**Front-End UI Components**
+- [`canvas-datagrid`](https://docs.sheetjs.com/docs/demos/grid#canvas-datagrid)
+- [`x-spreadsheet`](https://docs.sheetjs.com/docs/demos/grid#x-spreadsheet)
+- [`react-data-grid`](https://docs.sheetjs.com/docs/demos/grid#react-data-grid)
+- [`vue3-table-lite`](https://docs.sheetjs.com/docs/demos/grid#vue3-table-lite)
+- [`angular-ui-grid`](https://docs.sheetjs.com/docs/demos/grid#angular-ui-grid)
+
+**Platforms and Integrations**
+- [`Command-Line Tools`](https://docs.sheetjs.com/docs/demos/cli)
+- [`iOS and Android Mobile Applications`](https://docs.sheetjs.com/docs/demos/mobile)
+- [`NodeJS Server-Side Processing`](https://docs.sheetjs.com/docs/demos/server#nodejs)
+- [`Content Management and Static Sites`](https://docs.sheetjs.com/docs/demos/content)
+- [`Electron`](https://docs.sheetjs.com/docs/demos/desktop#electron)
+- [`NW.js`](https://docs.sheetjs.com/docs/demos/desktop#nwjs)
+- [`Tauri`](https://docs.sheetjs.com/docs/demos/desktop#tauri)
+- [`Chrome and Chromium Extensions`](https://docs.sheetjs.com/docs/demos/chromium)
+- [`Google Sheets API`](https://docs.sheetjs.com/docs/demos/gsheet)
+- [`ExtendScript for Adobe Apps`](https://docs.sheetjs.com/docs/demos/extendscript)
+- [`NetSuite SuiteScript`](https://docs.sheetjs.com/docs/demos/netsuite)
+- [`SalesForce Lightning Web Components`](https://docs.sheetjs.com/docs/demos/salesforce)
+- [`Excel JavaScript API`](https://docs.sheetjs.com/docs/demos/excel)
+- [`Headless Automation`](https://docs.sheetjs.com/docs/demos/headless)
+- [`Other JavaScript Engines`](https://docs.sheetjs.com/docs/demos/engines)
+- [`Azure Functions and Storage`](https://docs.sheetjs.com/docs/demos/azure)
+- [`Amazon Web Services`](https://docs.sheetjs.com/docs/demos/aws)
+- [`Databases and Structured Data Stores`](https://docs.sheetjs.com/docs/demos/database)
+- [`NoSQL and Unstructured Data Stores`](https://docs.sheetjs.com/docs/demos/nosql)
+- [`Legacy Internet Explorer`](https://docs.sheetjs.com/docs/demos/legacy#internet-explorer)
+
+**Bundlers and Tooling**
+- [`browserify`](https://docs.sheetjs.com/docs/demos/bundler#browserify)
+- [`bun`](https://docs.sheetjs.com/docs/demos/bundler#bun)
+- [`esbuild`](https://docs.sheetjs.com/docs/demos/bundler#esbuild)
+- [`parcel`](https://docs.sheetjs.com/docs/demos/bundler#parcel)
+- [`requirejs`](https://docs.sheetjs.com/docs/demos/bundler#requirejs)
+- [`rollup`](https://docs.sheetjs.com/docs/demos/bundler#rollup)
+- [`snowpack`](https://docs.sheetjs.com/docs/demos/bundler#snowpack)
+- [`swc`](https://docs.sheetjs.com/docs/demos/bundler#swc)
+- [`systemjs`](https://docs.sheetjs.com/docs/demos/bundler#systemjs)
+- [`vite`](https://docs.sheetjs.com/docs/demos/bundler#vite)
+- [`webpack`](https://docs.sheetjs.com/docs/demos/bundler#webpack)
+- [`wmr`](https://docs.sheetjs.com/docs/demos/bundler#wmr)
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/altjs/README.md
+++ b/demos/altjs/README.md
@ -0,0 +1,7 @@
+# Other JS Engines and Deployments
+
+[The new demo](https://docs.sheetjs.com/docs/demos/engines)
+includes more detailed instructions and more JS engines.
+
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/angular/README.md
+++ b/demos/angular/README.md
@ -0,0 +1,10 @@
+# AngularJS
+
+The content has been reorganized;
+
+- [The "Legacy Frameworks" section](https://docs.sheetjs.com/docs/demos/legacy#angularjs)
+  covers the AngularJS basics.
+- [The "Angular UI Grid" section](https://docs.sheetjs.com/docs/demos/legacy#angularjs)
+  covers the integration with Angular UI Grid.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/angular2/README.md
+++ b/demos/angular2/README.md
@ -0,0 +1,11 @@
+# Angular 2+
+
+[The new demo](https://docs.sheetjs.com/docs/demos/angular) has an updated
+exposition for legacy and modern deployments alike.
+
+The ecosystem demos were grouped by type in the new demo site:
+
+- [NativeScript](https://docs.sheetjs.com/docs/demos/mobile#nativescript) is now part of "iOS and Android Apps"
+- [Ionic](https://docs.sheetjs.com/docs/demos/mobile#ionic) is now part of "iOS and Android Apps"
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/array/README.md
+++ b/demos/array/README.md
@ -0,0 +1,6 @@
+# Typed Arrays and Math
+
+[The new demo](https://docs.sheetjs.com/docs/demos/ml) includes 
+interactive examples as well as strategies for CSV and JS Array interchange.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/browserify/README.md
+++ b/demos/browserify/README.md
@ -0,0 +1,6 @@
+# Browserify
+
+[The new demo](https://docs.sheetjs.com/docs/demos/bundler#browserify)
+includes a more concise example.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/chrome/README.md
+++ b/demos/chrome/README.md
@ -0,0 +1,6 @@
+# Chrome and Chromium
+
+[The new demo](https://docs.sheetjs.com/docs/demos/chromium)
+includes more up-to-date details.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/database/README.md
+++ b/demos/database/README.md
@ -0,0 +1,11 @@
+# Databases
+
+This demo has been split up for clarity:
+
+- <https://docs.sheetjs.com/docs/demos/database> covers SQL and
+  structured data (including CRUD operations)
+
+- https://docs.sheetjs.com/docs/demos/nosql covers unstructured
+  data including "NoSQL" data stores.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/datagrid/README.md
+++ b/demos/datagrid/README.md
@ -0,0 +1,7 @@
+# canvas-datagrid
+
+[The new demo](https://docs.sheetjs.com/docs/demos/grid#canvas-datagrid)
+includes a live example and improved explanations.
+
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/deno/README.md
+++ b/demos/deno/README.md
@ -0,0 +1,13 @@
+# Deno
+
+Deno is a runtime capable of running JS code including this library.
+
+Demos have been integrated in the [documentation](https://docs.sheetjs.com) :
+
+- <https://docs.sheetjs.com/docs/installation/deno> installation
+- <https://docs.sheetjs.com/docs/example> writing JS data to a spreadsheet
+- <https://docs.sheetjs.com/docs/solutions/input> input strategies
+- <https://docs.sheetjs.com/docs/solutions/output> output strategies
+- <https://docs.sheetjs.com/docs/demos/cli#deno> `deno compile`
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/electron/README.md
+++ b/demos/electron/README.md
@ -0,0 +1,6 @@
+# Electron
+
+[The new demo](https://docs.sheetjs.com/docs/demos/desktop#electron)
+includes an improved example and detailed explanations.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/extendscript/README.md
+++ b/demos/extendscript/README.md
@ -0,0 +1,7 @@
+# Adobe ExtendScript
+
+[The new demo](https://docs.sheetjs.com/docs/demos/extendscript)
+has a more focused Photoshop example as well as notes about other extensibility
+frameworks shipping with newer versions of Creative Cloud apps.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/function/README.md
+++ b/demos/function/README.md
@ -0,0 +1,9 @@
+# "Serverless" Functions
+
+Cloud services are covered in separate demos:
+
+- [AWS](https://docs.sheetjs.com/docs/demos/aws)
+- [Azure](https://docs.sheetjs.com/docs/demos/azure)
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
+
--- a/demos/google-sheet/README.md
+++ b/demos/google-sheet/README.md
@ -0,0 +1,9 @@
+# Google Sheets API
+
+The old demo used a deprecated version of the Google Sheets API to export data
+from Google Sheets Documents.
+
+[The new demo](https://docs.sheetjs.com/docs/demos/gsheet) uses
+the new Google Sheets API to read and write data.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/headless/README.md
+++ b/demos/headless/README.md
@ -0,0 +1,8 @@
+# Headless Browsers
+
+[The new demo](https://docs.sheetjs.com/docs/demos/headless)
+has a more focused table export example as well as a demo script for Chromium
+automation with Puppeteer and multi-browser automation with Playwright.
+
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/knockout/README.md
+++ b/demos/knockout/README.md
@ -0,0 +1,7 @@
+# Knockout
+
+[The new demo](https://docs.sheetjs.com/docs/demos/legacy#knockoutjs)
+includes a live example and improved explanations.
+
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/meteor/README.md
+++ b/demos/meteor/README.md
@ -0,0 +1,8 @@
+# Meteor
+
+This demo originally covered Meteor's package manager and other nuances.  At the
+time the demo was written, Meteor had its own ecosystem that clashed with the
+burgeoning NodeJS package ecosystem.  Eventually, Meteor added proper support
+for NodeJS modules.  New projects should follow the instructions for packages.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/nwjs/README.md
+++ b/demos/nwjs/README.md
@ -0,0 +1,6 @@
+# NW.js
+
+[The new demo](https://docs.sheetjs.com/docs/demos/desktop#nwjs)
+includes an improved example and detailed explanations.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/oldie/README.md
+++ b/demos/oldie/README.md
@ -0,0 +1,6 @@
+# Internet Explorer
+
+[The new demo](https://docs.sheetjs.com/docs/demos/legacy#internet-explorer)
+includes a live example and easier integration bundle.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/parcel/README.md
+++ b/demos/parcel/README.md
@ -0,0 +1,6 @@
+# Parcel
+
+[The new demo](https://docs.sheetjs.com/docs/demos/bundler#parcel)
+includes a more concise example.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/react/README.md
+++ b/demos/react/README.md
@ -0,0 +1,12 @@
+# React
+
+[The new demo](https://docs.sheetjs.com/docs/demos/react) has an updated
+exposition for legacy and modern deployments alike.
+
+The ecosystem demos were grouped by type in the new demo site:
+
+- [server-rendered React components with `next.js`](https://docs.sheetjs.com/docs/demos/content#nextjs) is now part of "Content and Site Generation"
+- [`react-native` deployment for iOS and android](https://docs.sheetjs.com/docs/demos/mobile#react-native) is now part of "iOS and Android Apps"
+- [`react-data-grid` reading, modifying, and writing files](https://docs.sheetjs.com/docs/demo/grid#react-data-grid) is now part of "Data Grids and UI"
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/requirejs/README.md
+++ b/demos/requirejs/README.md
@ -0,0 +1,7 @@
+# RequireJS
+
+[The new demo](https://docs.sheetjs.com/docs/demos/bundler#requirejs)
+includes a live example and improved explanations.
+
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/rollup/README.md
+++ b/demos/rollup/README.md
@ -0,0 +1,7 @@
+# Rollup
+
+[The new demo](https://docs.sheetjs.com/docs/demos/bundler#rollup)
+includes a simple example and improved explanations.
+
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/server/README.md
+++ b/demos/server/README.md
@ -0,0 +1,11 @@
+# NodeJS Server Deployments
+
+[The new demo](https://docs.sheetjs.com/docs/demos/server) has a more focused
+discussion with examples for popular JS server-side frameworks.
+
+Cloud services are covered in separate demos:
+
+- [AWS](https://docs.sheetjs.com/docs/demos/aws)
+- [Azure](https://docs.sheetjs.com/docs/demos/azure)
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/systemjs/README.md
+++ b/demos/systemjs/README.md
@ -0,0 +1,6 @@
+# SystemJS Demos
+
+[The new demo](https://docs.sheetjs.com/docs/demos/bundler#systemjs)
+includes a live example and improved explanations.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/typescript/README.md
+++ b/demos/typescript/README.md
@ -0,0 +1,9 @@
+# TypeScript
+
+This demo originally covered direct use of the `tsc` TypeScript compiler.  At
+the time when the demo was first written, TypeScript 2.2 had a module system
+that was incompatible with the pure JS ecosystem.  Since then, various
+language improvements and compiler changes have obviated this demo.  Uses of
+TypeScript are scattered throughout other demos.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/vue/README.md
+++ b/demos/vue/README.md
@ -0,0 +1,12 @@
+# VueJS
+
+[The new demo](https://docs.sheetjs.com/docs/demos/vue) has an updated
+exposition for legacy and modern deployments alike.
+
+The ecosystem demos were grouped by type in the new demo site:
+
+- [Nuxt Content](https://docs.sheetjs.com/docs/demos/content#nuxtjs) is now part of "Content and Site Generation"
+- [The new iOS app demo](https://docs.sheetjs.com/docs/demos/mobile#quasar) uses the Quasar Framework in a VueJS + Vite project to generate a native iOS app.
+- [`vue3-table-lite` reading, modifying, and writing files](https://docs.sheetjs.com/docs/demo/grid#vue3-table-lite) is now part of "Data Grids and UI"
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/webpack/README.md
+++ b/demos/webpack/README.md
@ -0,0 +1,6 @@
+# Webpack
+
+[The new demo](https://docs.sheetjs.com/docs/demos/bundler#webpack)
+reflects the new default behavior to use the ESM build.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/xhr/README.md
+++ b/demos/xhr/README.md
@ -0,0 +1,7 @@
+# XMLHttpRequest and fetch
+
+[The new demo](https://docs.sheetjs.com/docs/demos/network)
+includes interactive demos and improved explanations.
+
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/xspreadsheet/README.md
+++ b/demos/xspreadsheet/README.md
@ -0,0 +1,18 @@
+# x-spreadsheet
+
+The `sheet_to_json` utility function generates output arrays suitable for use
+with other JS libraries such as data grids for previewing data.  With a familiar
+UI, [`x-spreadsheet`](https://myliang.github.io/x-spreadsheet/) is an excellent
+choice for developers looking for a modern editor.
+
+[The new docs](https://docs.sheetjs.com/docs/demos/grid/#x-spreadsheet)
+include more detail and examples.
+
+The original demo is available at <https://docs.sheetjs.com/xspreadsheet/>
+
+A hosted version of the `xlsxspread.js` script is available on the SheetJS CDN:
+
+- <https://cdn.sheetjs.com/xspreadsheet/xlsxspread.js> original script
+- <https://cdn.sheetjs.com/xspreadsheet/xlsxspread.min.js> minified
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/xspreadsheet/xlsxspread.js
+++ b/demos/xspreadsheet/xlsxspread.js
@ -0,0 +1,133 @@
+/*! xlsxspread.js (C) SheetJS LLC -- https://sheetjs.com/ */
+/* eslint-env browser */
+/*global XLSX */
+/*exported stox, xtos */
+console.log("The latest version of the xlsxspread.js script is at https://cdn.sheetjs.com/xspreadsheet/xlsxspread.js !")
+
+/**
+ * Converts data from SheetJS to x-spreadsheet
+ *
+ * @param  {Object} wb SheetJS workbook object
+ *
+ * @returns {Object[]} An x-spreadsheet data
+ */
+function stox(wb) {
+  var out = [];
+  wb.SheetNames.forEach(function (name) {
+    var o = { name: name, rows: {} };
+    var ws = wb.Sheets[name];
+    if(!ws || !ws["!ref"]) return;
+    var range = XLSX.utils.decode_range(ws['!ref']);
+    // sheet_to_json will lost empty row and col at begin as default
+    range.s = { r: 0, c: 0 };
+    var aoa = XLSX.utils.sheet_to_json(ws, {
+      raw: false,
+      header: 1,
+      range: range
+    });
+
+    aoa.forEach(function (r, i) {
+      var cells = {};
+      r.forEach(function (c, j) {
+        cells[j] = { text: c };
+
+        var cellRef = XLSX.utils.encode_cell({ r: i, c: j });
+
+        if ( ws[cellRef] != null && ws[cellRef].f != null) {
+          cells[j].text = "=" + ws[cellRef].f;
+        }
+      });
+      o.rows[i] = { cells: cells };
+    });
+
+    o.merges = [];
+    (ws["!merges"]||[]).forEach(function (merge, i) {
+      //Needed to support merged cells with empty content
+      if (o.rows[merge.s.r] == null) {
+        o.rows[merge.s.r] = { cells: {} };
+      }
+      if (o.rows[merge.s.r].cells[merge.s.c] == null) {
+        o.rows[merge.s.r].cells[merge.s.c] = {};
+      }
+
+      o.rows[merge.s.r].cells[merge.s.c].merge = [
+        merge.e.r - merge.s.r,
+        merge.e.c - merge.s.c
+      ];
+
+      o.merges[i] = XLSX.utils.encode_range(merge);
+    });
+
+    out.push(o);
+  });
+
+  return out;
+}
+
+/**
+ * Converts data from x-spreadsheet to SheetJS
+ *
+ * @param  {Object[]} sdata An x-spreadsheet data object
+ *
+ * @returns {Object} A SheetJS workbook object
+ */
+function xtos(sdata) {
+  var out = XLSX.utils.book_new();
+  sdata.forEach(function (xws) {
+    var ws = {};
+    var rowobj = xws.rows;
+    var minCoord = { r: 0, c: 0 }, maxCoord = { r: 0, c: 0 };
+    for (var ri = 0; ri < rowobj.len; ++ri) {
+      var row = rowobj[ri];
+      if (!row) continue;
+
+      Object.keys(row.cells).forEach(function (k) {
+        var idx = +k;
+        if (isNaN(idx)) return;
+
+        var lastRef = XLSX.utils.encode_cell({ r: ri, c: idx });
+        if (ri > maxCoord.r) maxCoord.r = ri;
+        if (idx > maxCoord.c) maxCoord.c = idx;
+
+        var cellText = row.cells[k].text, type = "s";
+        if (!cellText) {
+          cellText = "";
+          type = "z";
+        } else if (!isNaN(Number(cellText))) {
+          cellText = Number(cellText);
+          type = "n";
+        } else if (cellText.toLowerCase() === "true" || cellText.toLowerCase() === "false") {
+          cellText = Boolean(cellText);
+          type = "b";
+        }
+
+        ws[lastRef] = { v: cellText, t: type };
+
+        if (type == "s" && cellText[0] == "=") {
+          ws[lastRef].f = cellText.slice(1);
+        }
+
+        if (row.cells[k].merge != null) {
+          if (ws["!merges"] == null) ws["!merges"] = [];
+
+          ws["!merges"].push({
+            s: { r: ri, c: idx },
+            e: {
+              r: ri + row.cells[k].merge[0],
+              c: idx + row.cells[k].merge[1]
+            }
+          });
+        }
+      });
+    }
+    ws["!ref"] = minCoord ? XLSX.utils.encode_range({
+      s: minCoord,
+      e: maxCoord
+    }) : "A1";
+
+    XLSX.utils.book_append_sheet(out, ws, xws.name);
+  });
+
+  return out;
+}
+
--- a/dist/cpexcel.d.ts
+++ b/dist/cpexcel.d.ts
@ -1,39 +0,0 @@
-/* codepage.js (C) 2013-present SheetJS -- http://sheetjs.com */
-// TypeScript Version: 2.2
-
-/** Codepage index type (integer or string representation) */
-export type CP$Index = number | string;
-
-/* Individual codepage converter */
-export interface CP$Conv {
-	enc: {[n: string]: number; };
-	dec: {[n: number]: string; };
-}
-
-/** Encode input type (string, array of characters, Buffer) */
-export type CP$String = string | string[] | Uint8Array;
-
-/** Encode output / decode input type */
-export type CP$Data = string | number[] | Uint8Array;
-
-/** General utilities */
-export interface CP$Utils {
-	decode(cp: CP$Index, data: CP$Data): string;
-	encode(cp: CP$Index, data: CP$String, opts?: any): CP$Data;
-	hascp(n: number): boolean;
-	magic: {[cp: string]: string};
-}
-
-/* note: TS cannot export top-level indexer, hence default workaround */
-export interface CP$Module {
-	/** Version string */
-	version: string;
-
-	/** Utility Functions */
-	utils: CP$Utils;
-
-	/** Codepage Converters */
-	[cp: number]: CP$Conv;
-}
-export const cptable: CP$Module;
-export default cptable;
--- a/dist/xlsx.core.min.js
+++ b/dist/xlsx.core.min.js
--- a/dist/xlsx.core.min.map
+++ b/dist/xlsx.core.min.map
--- a/dist/xlsx.extendscript.js
+++ b/dist/xlsx.extendscript.js
--- a/dist/xlsx.full.min.js
+++ b/dist/xlsx.full.min.js
--- a/dist/xlsx.full.min.map
+++ b/dist/xlsx.full.min.map
--- a/dist/xlsx.mini.min.js
+++ b/dist/xlsx.mini.min.js
--- a/dist/xlsx.mini.min.map
+++ b/dist/xlsx.mini.min.map
--- a/dist/xlsx.zahl.js
+++ b/dist/xlsx.zahl.js
--- a/dist/xlsx.zahl.mjs
+++ b/dist/xlsx.zahl.mjs
--- a/dist/zahl.d.ts
+++ b/dist/zahl.d.ts
@ -1,4 +0,0 @@
-/* zahl.d.ts (C) 2022-present SheetJS */
-// TypeScript Version: 2.2
-declare const XLSX_ZAHL_PAYLOAD: string;
-export default XLSX_ZAHL_PAYLOAD;
--- a/formats.png
+++ b/formats.png
--- a/hotcross.mjs
+++ b/hotcross.mjs
@ -5,6 +5,13 @@ var it = function(m,cb){console.log(" ".repeat(pdizzle) + m); ++pdizzle; if(cb)
 it.skip = function(m,cb){};
 var before = function(cb){if(cb) cb();};
 var afterEach = function(cb){if(cb) cb();};
+try {
+  new Buffer(925).copy(new Buffer(3072), 2048, 0, 925);
+} catch(e) {
+  Buffer.prototype.copy = function(dst, dstStart, srcStart, srcEnd) {
+    for(var j = srcStart; j < srcEnd; ++j) dst[j + dstStart] = this[j + srcStart];
+  };
+}
 /* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
 /* vim: set ts=2: */
 /*jshint mocha:true */
@ -684,7 +691,6 @@ describe('parse options', function() {
 		}); });
 	});
 });
-
 describe('input formats', function() {
 	if(false) it('should read binary strings', function() { artifax.forEach(function(p) {
 		X.read(fs.readFileSync(p, 'binary'), {type: 'binary'});
@ -692,22 +698,6 @@ describe('input formats', function() {
 	if(false) it('should read base64 strings', function() { artifax.forEach(function(p) {
 		X.read(fs.readFileSync(p, 'base64'), {type: 'base64'});
 	}); });
-	it('handles base64 within data URI scheme (gh-2762)', function() {
-		var data = 'TmFtZXMNCkhhZmV6DQpTYW0NCg==';
-
-		var wb0 = X.read(data, { type: 'base64' }); // raw base64 string
-		var wb1 = X.read('data:;base64,' + data, { type: 'base64' }); // data URI, no media type
-		var wb2 = X.read('data:text/csv;base64,' + data, { type: 'base64' }); // data URI, CSV type
-		var wb3 = X.read('data:application/vnd.ms-excel;base64,' + data, { type: 'base64' }); // data URI, Excel
-
-		[wb0, wb1, wb2, wb3].forEach(function(wb) {
-			var ws = wb.Sheets.Sheet1;
-			assert.equal(ws["!ref"], "A1:A3");
-			assert.equal(get_cell(ws, "A1").v, "Names");
-			assert.equal(get_cell(ws, "A2").v, "Hafez");
-			assert.equal(get_cell(ws, "A3").v, "Sam");
-		});
-	});
 	if(false) if(typeof Uint8Array !== 'undefined') it('should read array', function() { artifax.forEach(function(p) {
 		X.read(fs.readFileSync(p, 'binary').split("").map(function(x) { return x.charCodeAt(0); }), {type:'array'});
 	}); });
@ -1555,22 +1545,6 @@ describe('write features', function() {
 		assert.equal(Name.Ref, "Sheet1!$A$1:$C$3");
 		assert.equal(wb2.Workbook.Names.length, wb3.Workbook.Names.length);
 	}); });
-	it('should handle non-string values for "s" cells', function() {[
-		"xlsx", "xlsb", "xls", "biff5", "biff2", "xlml", "numbers", "ods", "fods", "wk3", "csv", "txt", "sylk", "html", "dif", "dbf", "wk1", "rtf", "prn"
-	].forEach(function(fmt) {
-		if(fmt == "numbers" && !can_write_numbers) return;
-		var ws = X.utils.aoa_to_sheet([
-			["String", "123"],
-			["Number", 123],
-			["Boolean", true],
-			["Date", new Date()],
-		], { cellDates: true });
-		ws["B2"].t = ws["B3"].t = ws["B4"].t = "s"
-		var wb = X.utils.book_new();
-		X.utils.book_append_sheet(wb, ws, "Sheet1");
-		X.write(wb, {type: TYPE, bookType: fmt, bookSST: false, numbers:XLSX_ZAHL});
-		X.write(wb, {type: TYPE, bookType: fmt, bookSST: true, numbers:XLSX_ZAHL});
-	}); });
 });

 function seq(end/*:number*/, start/*:?number*/)/*:Array<number>*/ {
@ -1580,30 +1554,28 @@ function seq(end/*:number*/, start/*:?number*/)/*:Array<number>*/ {
 	return o;
 }

-var dnthresh  = /*#__PURE__*/Date.UTC(1899, 11, 30, 0, 0, 0); // -2209161600000
-var dnthresh1 = /*#__PURE__*/Date.UTC(1899, 11, 31, 0, 0, 0); // -2209075200000
-var dnthresh2 = /*#__PURE__*/Date.UTC(1904, 0, 1, 0, 0, 0); // -2209075200000
+var basedate = new Date(1899, 11, 30, 0, 0, 0); // 2209161600000
 function datenum(v/*:Date*/, date1904/*:?boolean*/)/*:number*/ {
-	var epoch = /*#__PURE__*/v.getTime();
-	var res = (epoch - dnthresh) / (24 * 60 * 60 * 1000);
-	if(date1904) return res - 1462;
-	return res < 60 ? res - 1 : res;
+	var epoch = v.getTime();
+	if(date1904) epoch -= 1462*24*60*60*1000;
+	var dnthresh = basedate.getTime() + (v.getTimezoneOffset() - basedate.getTimezoneOffset()) * 60000;
+	return (epoch - dnthresh) / (24 * 60 * 60 * 1000);
 }
-/* Blame https://bugs.chromium.org/p/v8/issues/detail?id=7863 for the regexide */
-var pdre1 = /^(\d+):(\d+)(:\d+)?(\.\d+)?$/; // HH:MM[:SS[.UUU]]
-var pdre2 = /^(\d+)-(\d+)-(\d+)$/; // YYYY-mm-dd
-var pdre3 = /^(\d+)-(\d+)-(\d+)[T ](\d+):(\d+)(:\d+)?(\.\d+)?$/; // YYYY-mm-dd(T or space)HH:MM[:SS[.UUU]] sans "Z"
-/* parses a date string as a UTC date */
-function parseDate(str/*:string*/, date1904/*:boolean*/)/*:Date*/ {
-	if(str instanceof Date) return str;
-	var m = str.match(pdre1);
-	if(m) return new Date((date1904 ? dnthresh2 : dnthresh1) + ((parseInt(m[1], 10)*60 + parseInt(m[2], 10))*60 + (m[3] ? parseInt(m[3].slice(1), 10) : 0))*1000 + (m[4] ? parseInt((m[4]+"000").slice(1,4), 10) : 0));
-	m = str.match(pdre2);
-	if(m) return new Date(Date.UTC(+m[1], +m[2]-1, +m[3], 0, 0, 0, 0));
-	m = str.match(pdre3);
-	if(m) return new Date(Date.UTC(+m[1], +m[2]-1, +m[3], +m[4], +m[5], ((m[6] && parseInt(m[6].slice(1), 10))|| 0), ((m[7] && parseInt(m[7].slice(1), 10))||0)));
+var good_pd_date = new Date('2017-02-19T19:06:09.000Z');
+if(isNaN(good_pd_date.getFullYear())) good_pd_date = new Date('2017-02-19T19:06:09');
+if(isNaN(good_pd_date.getFullYear())) good_pd_date = new Date('2/19/17');
+var good_pd = good_pd_date.getFullYear() == 2017;
+function parseDate(str/*:string|Date*/)/*:Date*/ {
 	var d = new Date(str);
-	return d;
+	if(good_pd) return d;
+	if(str instanceof Date) return str;
+	if(good_pd_date.getFullYear() == 1917 && !isNaN(d.getFullYear())) {
+		var s = d.getFullYear();
+		if(str.indexOf("" + s) > -1) return d;
+		d.setFullYear(d.getFullYear() + 100); return d;
+	}
+	var n = str.match(/\d+/g)||["2017","2","19","0","0","0"];
+	return new Date(Date.UTC(+n[0], +n[1] - 1, +n[2], +n[3], +n[4], +n[5]));
 }

 var fixdate = browser ? parseDate("2014-02-19T14:30:00.000Z") : new Date("2014-02-19T14:30Z");
@ -1826,7 +1798,7 @@ describe('roundtrip features', function() {
 		];
 		var o = X.utils.sheet_to_json(X.utils.json_to_sheet(data, {cellDates:true}));
 		data.forEach(function(row, i) {
-			Object.keys(row).forEach(function(k) { assert.equal(row[k].valueOf(), o[i][k].valueOf()); });
+			Object.keys(row).forEach(function(k) { assert.equal(row[k], o[i][k]); });
 		});
 	});

@ -1913,21 +1885,6 @@ describe('invalid files', function() {
 			wb.SheetNames.push(wb.SheetNames[0]);
 			assert.throws(function() { X.write(wb, {type:'binary'}); });
 		});
-		it('should fail if sheet name is not valid', function() {
-			var names = [
-				"", // cannot be blank
-				"abcdefghijklmnopqrstuvwxyz1234567890", // cannot exceed 31 chars
-				"'sheetjs", "sheetjs'", // cannot start or end with apostrophe
-				"History", // cannot be History
-				"Sheet:JS", "Sheet]JS", "Sheet[JS", "Sheet*JS", // bad characters
-				"Sheet?JS", "Sheet\\JS", "Sheet\/JS"
-			];
-			names.forEach(function(n) { assert.throws(function() {
-				var wb = { SheetNames: [n], Sheets: {} };
-				wb.Sheets[n] = X.utils.aoa_to_sheet([["SheetJS"]]);
-				X.write(wb, {type:"binary", bookType:"xlsx"});
-			}); });
-		});
 	});
 });

@ -2199,15 +2156,7 @@ describe('CSV', function() {
 			assert.equal(cell.w, '2/19/14');
 		});
 		it('should honor dateNF override', function() {
-			var opts = ({type:"buffer", dateNF:"YYYY-MM-DD", cellNF: true}/*:any*/);
-			var cell = get_cell(X.read(b, opts).Sheets["Sheet1"], "C3");
-			/* NOTE: IE interprets 2-digit years as 19xx */
-			assert.ok(cell.w == '2014-02-19' || cell.w == '1914-02-19' || cell.w == "2/19/14");
-			assert.equal(cell.z, "YYYY-MM-DD");
-			opts.cellDates = true; opts.dateNF = "YY-MM-DD";
-			cell = get_cell(X.read(b, opts).Sheets["Sheet1"], "C3");
-			assert.ok(cell.w == '14-02-19' || cell.w == "2/19/14");
-			var opts = ({type:"buffer", dateNF:"YYYY-MM-DD", UTC: true}/*:any*/);
+			var opts = ({type:"buffer", dateNF:"YYYY-MM-DD"}/*:any*/);
 			var cell = get_cell(X.read(b, opts).Sheets["Sheet1"], "C3");
 			/* NOTE: IE interprets 2-digit years as 19xx */
 			assert.ok(cell.w == '2014-02-19' || cell.w == '1914-02-19');
@ -2221,18 +2170,10 @@ describe('CSV', function() {
 			var cell = get_cell(X.read(bb, opts).Sheets["Sheet1"], "C3");
 			assert.equal(cell.v.getMonth(), 1);
 			assert.equal(cell.w, "2/3/14");
-			opts.dateNF = 'd/m/yy';
+			opts = {type:"buffer", cellDates:true, dateNF:'d/m/yy'};
 			cell = get_cell(X.read(bb, opts).Sheets["Sheet1"], "C3");
 			assert.equal(cell.v.getMonth(), 2);
 			assert.equal(cell.w, "2/3/14");
-			opts = {type:"buffer", cellDates:true, dateNF:'m/d/yy', UTC: true};
-			cell = get_cell(X.read(bb, opts).Sheets["Sheet1"], "C3");
-			assert.equal(cell.v.getUTCMonth(), 1);
-			assert.equal(cell.w, "2/3/14");
-			opts.dateNF = 'd/m/yy';
-			cell = get_cell(X.read(bb, opts).Sheets["Sheet1"], "C3");
-			assert.equal(cell.v.getUTCMonth(), 2);
-			assert.equal(cell.w, "2/3/14");
 		});
 		it('should interpret values by default', function() { plaintext_test(X.read(csv_bstr, {type:"buffer"}), false); });
 		it('should generate strings if raw option is passed', function() { plaintext_test(X.read(csv_str, {type:"string", raw:true}), true); });
@ -2256,48 +2197,6 @@ describe('CSV', function() {
 				assert.equal(get_cell(ws, "B2").v,  "j" + m[1] + "l");
 			});
 		});
-		it('should parse date-less meridien time values', function() {
-			var aoa = [
-				["3a", "3 a", "3 a-1"],
-				["3b", "3 b", "3 b-1"],
-				["3p", "3 P", "3 p-1"]
-			];
-			var ws = X.read(aoa.map(function(row) { return row.join(","); }).join("\n"), {type: "string", cellDates: true}).Sheets.Sheet1;
-			for(var R = 0; R < 3; ++R) {
-				assert.equal(get_cell(ws, "A" + (R+1)).v, aoa[R][0]);
-				assert.equal(get_cell(ws, "C" + (R+1)).v, aoa[R][2]);
-			}
-			assert.equal(get_cell(ws, "B2").v, "3 b");
-			var B1 = get_cell(ws, "B1"); assert.equal(B1.t, "d"); assert.equal(B1.v.getHours(), 3);
-			var B3 = get_cell(ws, "B3"); assert.equal(B3.t, "d"); assert.equal(B3.v.getHours(), 15);
-			ws = X.read(aoa.map(function(row) { return row.join(","); }).join("\n"), {type: "string", cellDates: false}).Sheets.Sheet1;
-			for(var R = 0; R < 3; ++R) {
-				assert.equal(get_cell(ws, "A" + (R+1)).v, aoa[R][0]);
-				assert.equal(get_cell(ws, "C" + (R+1)).v, aoa[R][2]);
-			}
-			assert.equal(get_cell(ws, "B2").v, "3 b");
-			/* this particular case is not well-defined */
-			//var B1 = get_cell(ws, "B1"); assert.equal(B1.t, "n"); assert.equal((24 + Math.round(B1.v * 24)) % 24, Math.round(3 + 24 + new Date(1899,11,31,0,0,0,0).getTimezoneOffset()/60) % 24);
-			//var B3 = get_cell(ws, "B3"); assert.equal(B3.t, "n"); assert.equal((24 + Math.round(B3.v * 24)) % 24, Math.round(15 + 24 + new Date(1899,11,31,0,0,0,0).getTimezoneOffset()/60) % 24);
-
-			ws = X.read(aoa.map(function(row) { return row.join(","); }).join("\n"), {type: "string", cellDates: true, UTC: true}).Sheets.Sheet1;
-			for(var R = 0; R < 3; ++R) {
-				assert.equal(get_cell(ws, "A" + (R+1)).v, aoa[R][0]);
-				assert.equal(get_cell(ws, "C" + (R+1)).v, aoa[R][2]);
-			}
-			assert.equal(get_cell(ws, "B2").v, "3 b");
-			B1 = get_cell(ws, "B1"); assert.equal(B1.t, "d"); assert.equal(B1.v.getUTCHours(), 3);
-			B3 = get_cell(ws, "B3"); assert.equal(B3.t, "d"); assert.equal(B3.v.getUTCHours(), 15);
-			ws = X.read(aoa.map(function(row) { return row.join(","); }).join("\n"), {type: "string", cellDates: false, UTC: true}).Sheets.Sheet1;
-			for(var R = 0; R < 3; ++R) {
-				assert.equal(get_cell(ws, "A" + (R+1)).v, aoa[R][0]);
-				assert.equal(get_cell(ws, "C" + (R+1)).v, aoa[R][2]);
-			}
-			assert.equal(get_cell(ws, "B2").v, "3 b");
-			B1 = get_cell(ws, "B1"); assert.equal(B1.t, "n"); assert.equal(B1.v * 24, 3);
-			B3 = get_cell(ws, "B3"); assert.equal(B3.t, "n"); assert.equal(B3.v * 24, 15);
-
-		});
 	});
 	describe('output', function(){
 		var data, ws;
@ -2446,36 +2345,19 @@ describe('dbf', function() {
 		['d11',  dir + 'dbf/d11.dbf'],
 		['vfp3', dir + 'dbf/vfp3.dbf']
 	]/*:any*/);
-	var wbstrue = ([]);
-	var wbsfalse = ([]);
 	var bef = (function() {
-		wbsfalse = wbs.map(function(x) { return [x[0], X.read(fs.readFileSync(x[1]), { type:TYPE, UTC: false })]; });
-		wbstrue  = wbs.map(function(x) { return [x[0], X.read(fs.readFileSync(x[1]), { type:TYPE, UTC: true })]; });
+		wbs = wbs.map(function(x) { return [x[0], X.read(fs.readFileSync(x[1]), {type:TYPE})]; });
 	});
 	if(typeof before != 'undefined') before(bef);
 	else it('before', bef);
 	it(wbs[1][0], function() {
-		var wstrue = wbstrue[1][1].Sheets["Sheet1"];
-		var wsfalse = wbsfalse[1][1].Sheets["Sheet1"];
+		var ws = wbs[1][1].Sheets["Sheet1"];
 		[
-			["A1", "v", "CHAR10"], ["A2", "v", "test1"], ["B2", "v", 123.45], ["C2", "v", 12.345], ["D2", "v", 1234.1],
-			["E2", "w", "19170219", (new Date(1917,1,19).getTimezoneOffset() > 0 ? "19170218" : "19170219")],
-			["F2", "w", "19170219", (new Date(1917,1,19).getTimezoneOffset() > 0 ? "19170218" : "19170219")],
-			["G2", "v", 1231.4], ["H2", "v", 123234], ["I2", "v", true], ["L2", "v", "SheetJS"]
-		].forEach(function(r) {
-			assert.equal(get_cell(wstrue, r[0])[r[1]], r[2]);
-			assert.equal(get_cell(wsfalse, r[0])[r[1]], r[3] || r[2]);
-		});
-	});
-	if(!browser || typeof cptable !== 'undefined') it("Ś╫êëτ⌡ś and Š╫ěéτ⌡š", function() {
-		[ [620, "Ś╫êëτ⌡ś"], [895, "Š╫ěéτ⌡š"] ].forEach(function(r) {
-			var book = X.utils.book_new();
-			var sheet = X.utils.aoa_to_sheet([["ASCII", "encoded"], ["Test", r[1]]]);
-			X.utils.book_append_sheet(book, sheet, "sheet1");
-			var data = X.write(book, {type: TYPE, bookType: "dbf", codepage:r[0]});
-			var wb = X.read(data, {type: TYPE});
-			assert.equal(wb.Sheets.Sheet1.B2.v, r[1]);
-		});
+			["A1", "v", "CHAR10"], ["A2", "v", "test1"], ["B2", "v", 123.45],
+			["C2", "v", 12.345], ["D2", "v", 1234.1], ["E2", "w", "19170219"],
+			/* [F2", "w", "19170219"], */ ["G2", "v", 1231.4], ["H2", "v", 123234],
+			["I2", "v", true], ["L2", "v", "SheetJS"]
+		].forEach(function(r) { assert.equal(get_cell(ws, r[0])[r[1]], r[2]); });
 	});
 });
 //import { JSDOM } from 'jsdom';
--- a/Show More
+++ b/Show More