diff --git a/README.md b/README.md
index 04ae9ea..2725ee9 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,7 @@ with a unified JS representation, and ES3/ES5 browser compatibility back to IE6.
   * [Supported Output Formats](#supported-output-formats)
   * [Output Type](#output-type)
 - [Utility Functions](#utility-functions)
+  * [Array of Arrays Input](#array-of-arrays-input)
   * [Formulae Output](#formulae-output)
   * [CSV and general DSV Output](#csv-and-general-dsv-output)
   * [JSON](#json)
@@ -98,6 +99,7 @@ CDNjs automatically pulls the latest version and makes all versions available at
 
 The `demos` directory includes sample projects for:
 
+- [`angular`](demos/angular/)
 - [`browserify`](demos/browserify/)
 - [`requirejs`](demos/requirejs/)
 - [`systemjs`](demos/systemjs/)
@@ -377,12 +379,19 @@ Parse options are described in the [Parsing Options](#parsing-options) section.
 
 `XLSX.writeFile(wb, filename, write_opts)` attempts to write `wb` to `filename`
 
+`XLSX.writeFileAsync(filename, wb, o, cb)` attempts to write `wb` to `filename`.
+If `o` is omitted, the writer will use the third argument as the callback.
+
 Write options are described in the [Writing Options](#writing-options) section.
 
 ### Utilities
 
 Utilities are available in the `XLSX.utils` object:
 
+**Importing:**
+
+- `aoa_to_sheet` converts an array of arrays of JS data to a worksheet.
+
 **Exporting:**
 
 - `sheet_to_json` converts a worksheet object to an array of JSON objects.
@@ -655,7 +664,7 @@ objects which have the following properties:
 ```typescript
 type ColInfo = {
 	MDW?:number;  // Excel's "Max Digit Width" unit, always integral
-	width:number; // width in Excel's "Max Digit Width", width*256 is integral 
+	width:number; // width in Excel's "Max Digit Width", width*256 is integral
 	wpx?:number;  // width in screen pixels
 	wch?:number;  // intermediate character calculation
 };
@@ -666,7 +675,8 @@ follow the priority order:
 
 1) use `width` field if available
 2) use `wpx` pixel width if available
-2) use `wch` character count if available
+3) use `wch` character count if available
+
 ## Parsing Options
 
 The exported `read` and `readFile` functions accept an options argument:
@@ -674,7 +684,7 @@ The exported `read` and `readFile` functions accept an options argument:
 | Option Name | Default | Description                                          |
 | :---------- | ------: | :--------------------------------------------------- |
 | type        |         | Input data encoding (see Input Type below)           |
-| cellFormula | true    | Save formulae to the .f field **                     |
+| cellFormula | true    | Save formulae to the .f field                        |
 | cellHTML    | true    | Parse rich text and save HTML to the .h field        |
 | cellNF      | false   | Save number format string to the .z field            |
 | cellStyles  | false   | Save style/theme info to the .s field                |
@@ -689,8 +699,6 @@ The exported `read` and `readFile` functions accept an options argument:
 | password    | ""      | If defined and file is encrypted, use password **    |
 | WTF         | false   | If true, throw errors on unexpected file features ** |
 
-- `cellFormula` option only applies to formats that require extra processing to
-  parse formulae (XLS/XLSB).
 - Even if `cellNF` is false, formatted text will be generated and saved to `.w`
 - In some cases, sheets may be parsed even if `bookSheets` is false.
 - `bookSheets` and `bookProps` combine to give both sets of information
@@ -794,6 +802,8 @@ The `type` argument for `write` mirrors the `type` argument for `read`:
 
 The `sheet_to_*` functions accept a worksheet and an optional options object.
 
+The `*_to_sheet` functions accept a data object and an optional options object.
+
 The examples are based on the following worksheet:
 
 ```
@@ -804,6 +814,30 @@ XXX| A | B | C | D | E | F | G |
  3 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
 ```
 
+### Array of Arrays Input
+
+`XLSX.utils.aoa_to_sheet` takes an array of arrays of JS values and returns a
+worksheet resembling the input data.  Numbers, Booleans and Strings are stored
+as the corresponding styles.  Dates are stored as date or numbers.  Array holes
+and explicit `undefined` values are skipped.  `null` values may be stubbed. All
+other values are stored as strings.  The function takes an options argument:
+
+| Option Name |  Default | Description                                         |
+| :---------- | :------: | :-------------------------------------------------- |
+| dateNF      |  fmt 14  | Use specified date format in string output          |
+| cellDates   |  false   | Store dates as type `d` (default is `n`)            |
+| sheetStubs  |  false   | Create cell objects of type `z` for `null` values   |
+
+To generate the example sheet:
+
+```js
+var ws = XLSX.utils.aoa_to_sheet([
+	"SheetJS".split(""),
+	[1,2,3,4,5,6,7],
+	[2,3,4,5,6,7,8]
+]);
+```
+
 ### Formulae Output
 
 `XLSX.utils.sheet_to_formulae` generates an array of commands that represent
@@ -828,8 +862,10 @@ produces CSV output.  The function takes an options argument:
 | RS          |  `"\n"`  | "Record Separator" delimiter between rows           |
 | dateNF      |  fmt 14  | Use specified date format in string output          |
 | strip       |  false   | Remove trailing field separators in each record **  |
+| blankrows   |  true    | Include blank lines in the CSV output               |
 
 - `strip` will remove trailing commas from each line under default `FS/RS`
+- blankrows must be set to `false` to skip blank lines.
 
 For the example sheet:
 
@@ -858,6 +894,7 @@ generate different types of JS objects.  The function takes an options argument:
 | header      |          | Control output format (see table below)             |
 | dateNF      |  fmt 14  | Use specified date format in string output          |
 | defval      |          | Use specified value in place of null or undefined   |
+| blankrows   |    **    | Include blank lines in the output **                |
 
 - `raw` only affects cells which have a format code (`.z`) field or a formatted
   text (`.w`) field.
@@ -869,6 +906,10 @@ generate different types of JS objects.  The function takes an options argument:
 - `null` values are returned when `raw` is true but are skipped when false.
 - If `defval` is not specified, null and undefined values are skipped normally.
   If specified, all null and undefined points will be filled with `defval`
+- When `header` is `1`, the default is to generate blank rows.  `blankrows` must
+  be set to `false` to skip blank rows.
+- When `header` is not `1`, the default is to skip blank rows.  `blankrows` must
+  be truthy to generate blank rows
 
 `range` is expected to be one of:
 
@@ -887,6 +928,9 @@ generate different types of JS objects.  The function takes an options argument:
 | array of strings | Use specified strings as keys in row objects              |
 | (default)        | Read and disambiguate first row as keys                   |
 
+If header is not `1`, the row object will contain the non-enumerable property
+`__rowNum__` that represents the row of the sheet corresponding to the entry.
+
 For the example sheet:
 
 ```js
diff --git a/bits/10_ssf.js b/bits/10_ssf.js
index 2a2f67d..a2a72d0 100644
--- a/bits/10_ssf.js
+++ b/bits/10_ssf.js
@@ -332,7 +332,7 @@ function write_num_flt(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 	if(fmt.charCodeAt(fmt.length - 1) === 44) return write_num_cm(type, fmt, val);
 	if(fmt.indexOf('%') !== -1) return write_num_pct(type, fmt, val);
 	if(fmt.indexOf('E') !== -1) return write_num_exp(fmt, val);
-	if(fmt.charCodeAt(0) === 36) return "$"+write_num_flt(type,fmt.substr(fmt[1]==' '?2:1),val);
+	if(fmt.charCodeAt(0) === 36) return "$"+write_num_flt(type,fmt.substr(fmt.charAt(1)==' '?2:1),val);
 	var o;
 	var r/*:?Array<string>*/, ri, ff, aval = Math.abs(val), sign = val < 0 ? "-" : "";
 	if(fmt.match(/^00+$/)) return sign + pad0r(aval,fmt.length);
@@ -358,7 +358,7 @@ function write_num_flt(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 	if((r = fmt.match(/^([0#]+)(\\?-([0#]+))+$/))) {
 		o = _strrev(write_num_flt(type, fmt.replace(/[\\-]/g,""), val));
 		ri = 0;
-		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o[ri++]:x==='0'?'0':"";}));
+		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o.charAt(ri++):x==='0'?'0':"";}));
 	}
 	if(fmt.match(phone)) {
 		o = write_num_flt(type, "##########", val);
@@ -370,7 +370,7 @@ function write_num_flt(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 		ff = frac(aval, Math.pow(10,ri)-1, false);
 		o = "" + sign;
 		oa = write_num("n", /*::String(*/r[1]/*::)*/, ff[1]);
-		if(oa[oa.length-1] == " ") oa = oa.substr(0,oa.length-1) + "0";
+		if(oa.charAt(oa.length-1) == " ") oa = oa.substr(0,oa.length-1) + "0";
 		o += oa + /*::String(*/r[2]/*::)*/ + "/" + /*::String(*/r[3]/*::)*/;
 		oa = rpad_(ff[2],ri);
 		if(oa.length < r[4].length) oa = hashq(r[4].substr(r[4].length-oa.length)) + oa;
@@ -441,7 +441,7 @@ function write_num_int(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 	if(fmt.charCodeAt(fmt.length - 1) === 44) return write_num_cm2(type, fmt, val);
 	if(fmt.indexOf('%') !== -1) return write_num_pct2(type, fmt, val);
 	if(fmt.indexOf('E') !== -1) return write_num_exp2(fmt, val);
-	if(fmt.charCodeAt(0) === 36) return "$"+write_num_int(type,fmt.substr(fmt[1]==' '?2:1),val);
+	if(fmt.charCodeAt(0) === 36) return "$"+write_num_int(type,fmt.substr(fmt.charAt(1)==' '?2:1),val);
 	var o;
 	var r, ri, ff, aval = Math.abs(val), sign = val < 0 ? "-" : "";
 	if(fmt.match(/^00+$/)) return sign + pad0(aval,fmt.length);
@@ -471,7 +471,7 @@ function write_num_int(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 	if((r = fmt.match(/^([0#]+)(\\?-([0#]+))+$/))) {
 		o = _strrev(write_num_int(type, fmt.replace(/[\\-]/g,""), val));
 		ri = 0;
-		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o[ri++]:x==='0'?'0':"";}));
+		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o.charAt(ri++):x==='0'?'0':"";}));
 	}
 	if(fmt.match(phone)) {
 		o = write_num_int(type, "##########", val);
@@ -483,7 +483,7 @@ function write_num_int(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 		ff = frac(aval, Math.pow(10,ri)-1, false);
 		o = "" + sign;
 		oa = write_num("n", r[1], ff[1]);
-		if(oa[oa.length-1] == " ") oa = oa.substr(0,oa.length-1) + "0";
+		if(oa.charAt(oa.length-1) == " ") oa = oa.substr(0,oa.length-1) + "0";
 		o += oa + r[2] + "/" + r[3];
 		oa = rpad_(ff[2],ri);
 		if(oa.length < r[4].length) oa = hashq(r[4].substr(r[4].length-oa.length)) + oa;
@@ -735,7 +735,7 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 				j=out[i].v.indexOf(".")>-1&&i===decpt?out[i].v.indexOf(".")-1:out[i].v.length-1;
 				vv = out[i].v.substr(j+1);
 				for(; j>=0; --j) {
-					if(jj>=0 && (out[i].v[j] === "0" || out[i].v[j] === "#")) vv = ostr[jj--] + vv;
+					if(jj>=0 && (out[i].v.charAt(j) === "0" || out[i].v.charAt(j) === "#")) vv = ostr.charAt(jj--) + vv;
 				}
 				out[i].v = vv;
 				out[i].t = 't';
@@ -748,7 +748,7 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 				j=out[i].v.indexOf(".")>-1&&i===decpt?out[i].v.indexOf(".")+1:0;
 				vv = out[i].v.substr(0,j);
 				for(; j<out[i].v.length; ++j) {
-					if(jj<ostr.length) vv += ostr[jj++];
+					if(jj<ostr.length) vv += ostr.charAt(jj++);
 				}
 				out[i].v = vv;
 				out[i].t = 't';
diff --git a/bits/20_jsutils.js b/bits/20_jsutils.js
index c070ecb..7d19c20 100644
--- a/bits/20_jsutils.js
+++ b/bits/20_jsutils.js
@@ -34,6 +34,18 @@ function datenum(v/*:Date*/, date1904/*:?boolean*/)/*:number*/ {
 	if(date1904) epoch += 1462*24*60*60*1000;
 	return (epoch + 2209161600000) / (24 * 60 * 60 * 1000);
 }
+function numdate(v/*:number*/)/*:Date*/ {
+	var date = SSF.parse_date_code(v);
+	var val = new Date();
+	if(date == null) throw new Error("Bad Date Code: " + v);
+	val.setUTCDate(date.d);
+	val.setUTCMonth(date.m-1);
+	val.setUTCFullYear(date.y);
+	val.setUTCHours(date.H);
+	val.setUTCMinutes(date.M);
+	val.setUTCSeconds(date.S);
+	return val;
+}
 
 /* ISO 8601 Duration */
 function parse_isodur(s) {
diff --git a/bits/27_csfutils.js b/bits/27_csfutils.js
new file mode 100644
index 0000000..9d5e13e
--- /dev/null
+++ b/bits/27_csfutils.js
@@ -0,0 +1,36 @@
+function sheet_to_workbook(sheet/*:Worksheet*/, opts)/*:Workbook*/ {
+	var n = opts && opts.sheet ? opts.sheet : "Sheet1";
+	var sheets = {}; sheets[n] = sheet;
+	return { SheetNames: [n], Sheets: sheets };
+}
+
+function aoa_to_sheet(data/*:AOA*/, opts/*:?any*/)/*:Worksheet*/ {
+	var o = opts || {};
+	var ws/*:Worksheet*/ = ({}/*:any*/);
+	var range/*:Range*/ = ({s: {c:10000000, r:10000000}, e: {c:0, r:0}}/*:any*/);
+	for(var R = 0; R != data.length; ++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*/);
+			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;
+			if(range.e.c < C) range.e.c = C;
+			var cell_ref = encode_cell(({c:C,r:R}/*:any*/));
+			if(cell.v === null) { if(!o.cellStubs) continue; cell.t = 'z'; }
+			else if(typeof cell.v === 'number') cell.t = 'n';
+			else if(typeof cell.v === 'boolean') cell.t = 'b';
+			else if(cell.v instanceof Date) {
+				cell.z = o.dateNF || SSF._table[14];
+				if(o.cellDates) cell.t = 'd';
+				else { cell.t = 'n'; cell.v = datenum(cell.v); }
+				cell.w = SSF.format(cell.z, cell.v);
+			}
+			else cell.t = 's';
+			ws[cell_ref] = cell;
+		}
+	}
+	if(range.s.c < 10000000) ws['!ref'] = encode_range(range);
+	return ws;
+}
+
diff --git a/bits/47_styxml.js b/bits/47_styxml.js
index fa4434f..d161995 100644
--- a/bits/47_styxml.js
+++ b/bits/47_styxml.js
@@ -222,7 +222,7 @@ function parse_numFmts(t, styles, opts) {
 
 function write_numFmts(NF/*:{[n:number]:string}*/, opts) {
 	var o = ["<numFmts>"];
-	[[5,8],[23,26],[41,44],[63,66],[164,392]].forEach(function(r) {
+	[[5,8],[23,26],[41,44],[/*63*/50,/*66],[164,*/392]].forEach(function(r) {
 		for(var i = r[0]; i <= r[1]; ++i) if(NF[i] != null) o[o.length] = (writextag('numFmt',null,{numFmtId:i,formatCode:escapexml(NF[i])}));
 	});
 	if(o.length === 1) return "";
diff --git a/bits/62_fxls.js b/bits/62_fxls.js
index 3618723..0b1d9dd 100644
--- a/bits/62_fxls.js
+++ b/bits/62_fxls.js
@@ -806,18 +806,18 @@ function stringify_formula(formula/*Array<any>*/, range, cell/*:any*/, supbooks,
 			/* 2.5.198.31 TODO */
 			case 'PtgAreaN':
 				type = f[1][0]; r = shift_range_xls(f[1][1], _range, opts);
-				stack.push(encode_range_xls(r, opts));
+				stack.push(encode_range_xls((r/*:any*/), opts));
 				break;
 			/* 2.5.198.27 TODO: fixed points */
 			case 'PtgArea':
 				type = f[1][0]; r = shift_range_xls(f[1][1], _range, opts);
-				stack.push(encode_range_xls(r, opts));
+				stack.push(encode_range_xls((r/*:any*/), opts));
 				break;
 			/* 2.5.198.28 */
 			case 'PtgArea3d': // TODO: lots of stuff
 				type = f[1][0]; ixti = /*::Number(*/f[1][1]/*::)*/; r = f[1][2];
 				sname = (supbooks && supbooks[1] ? supbooks[1][ixti+1] : "**MISSING**");
-				stack.push(sname + "!" + encode_range(r));
+				stack.push(sname + "!" + encode_range((r/*:any*/)));
 				break;
 			/* 2.5.198.41 */
 			case 'PtgAttrSum':
diff --git a/bits/75_xlml.js b/bits/75_xlml.js
index b5771cc..63c3ce5 100644
--- a/bits/75_xlml.js
+++ b/bits/75_xlml.js
@@ -167,6 +167,7 @@ function xlml_normalize(d)/*:string*/ {
 var xlmlregex = /<(\/?)([^\s?>!\/:]*:|)([^\s?>]*[^\s?>\/])[^>]*>/mg;
 //var xlmlregex = /<(\/?)([a-z0-9]*:|)(\w+)[^>]*>/mg;
 function parse_xlml_xml(d, opts)/*:Workbook*/ {
+	make_ssf(SSF);
 	var str = debom(xlml_normalize(d));
 	if(opts && opts.type == 'binary' && typeof cptable !== 'undefined') str = cptable.utils.decode(65001, char_codes(str));
 	if(str.substr(0,1000).indexOf("<html") >= 0) return parse_html(str, opts);
@@ -277,7 +278,10 @@ function parse_xlml_xml(d, opts)/*:Workbook*/ {
 			break;
 
 		case 'NumberFormat':
-			stag.nf = xlml_parsexmltag(Rn[0]).Format || "General";
+			stag.nf = unescapexml(xlml_parsexmltag(Rn[0]).Format || "General");
+			if(XLMLFormatMap[stag.nf]) stag.nf = XLMLFormatMap[stag.nf];
+			for(var ssfidx = 0; ssfidx != 0x188; ++ssfidx) if(SSF._table[ssfidx] == stag.nf) break;
+			if(ssfidx == 0x188) for(ssfidx = 0x39; ssfidx != 0x188; ++ssfidx) if(SSF._table[ssfidx] == null) { SSF.load(stag.nf, ssfidx); break; }
 			break;
 
 		case 'Column':
diff --git a/bits/76_xls.js b/bits/76_xls.js
index bd4d2f0..e58ca8c 100644
--- a/bits/76_xls.js
+++ b/bits/76_xls.js
@@ -85,7 +85,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 	var out = {};
 	var Directory = {};
 	var found_sheet = false;
-	var range = {};
+	var range/*:Range*/ = ({}/*:any*/);
 	var last_formula = null;
 	var sst = [];
 	var cur_sheet = "";
diff --git a/bits/88_write.js b/bits/88_write.js
index 7c00861..bc14916 100644
--- a/bits/88_write.js
+++ b/bits/88_write.js
@@ -59,9 +59,7 @@ function writeSync(wb/*:Workbook*/, opts/*:?WriteOpts*/) {
 	}
 }
 
-function writeFileSync(wb/*:Workbook*/, filename/*:string*/, opts/*:?WriteFileOpts*/) {
-	var o = opts||{}; o.type = 'file';
-	o.file = filename;
+function resolve_book_type(o/*?WriteFileOpts*/) {
 	if(!o.bookType) switch(o.file.slice(-5).toLowerCase()) {
 		case '.xlsx': o.bookType = 'xlsx'; break;
 		case '.xlsm': o.bookType = 'xlsm'; break;
@@ -74,6 +72,20 @@ function writeFileSync(wb/*:Workbook*/, filename/*:string*/, opts/*:?WriteFileOp
 		case '.ods': o.bookType = 'ods'; break;
 		case '.csv': o.bookType = 'csv'; break;
 	}}
+}
+
+function writeFileSync(wb/*:Workbook*/, filename/*:string*/, opts/*:?WriteFileOpts*/) {
+	var o = opts||{}; o.type = 'file';
+	o.file = filename;
+	resolve_book_type(o);
 	return writeSync(wb, o);
 }
 
+function writeFileAsync(filename/*:string*/, wb/*:Workbook*/, opts/*:?WriteFileOpts*/, cb/*:?(e?:ErrnoError)=>void*/) {
+	var o = opts||{}; o.type = 'file';
+	o.file = filename;
+	resolve_book_type(o);
+	o.type = 'buffer';
+	var _cb = cb; if(!(_cb instanceof Function)) _cb = (opts/*:any*/);
+	return _fs.writeFile(filename, writeSync(wb, o), _cb);
+}
diff --git a/bits/90_utils.js b/bits/90_utils.js
index 91a27db..0e88e9d 100644
--- a/bits/90_utils.js
+++ b/bits/90_utils.js
@@ -14,7 +14,8 @@ function encode_cell(cell/*:CellAddress*/)/*:string*/ { return encode_col(cell.c
 function fix_cell(cstr/*:string*/)/*:string*/ { return fix_col(fix_row(cstr)); }
 function unfix_cell(cstr/*:string*/)/*:string*/ { return unfix_col(unfix_row(cstr)); }
 function decode_range(range/*:string*/)/*:Range*/ { var x =range.split(":").map(decode_cell); return {s:x[0],e:x[x.length-1]}; }
-function encode_range(cs/*:any*/,ce/*:?any*/)/*:string*/ {
+/*# if only one arg, it is assumed to be a Range.  If 2 args, both are cell addresses */
+function encode_range(cs/*:CellAddrSpec|Range*/,ce/*:?CellAddrSpec*/)/*:string*/ {
 	if(typeof ce === 'undefined' || typeof ce === 'number') {
 /*:: if(!(cs instanceof Range)) throw "unreachable"; */
 		return encode_range(cs.s, cs.e);
@@ -69,8 +70,8 @@ function format_cell(cell/*:Cell*/, v/*:any*/, o/*:any*/) {
 	if(cell == null || cell.t == null || cell.t == 'z') return "";
 	if(cell.w !== undefined) return cell.w;
 	if(cell.t == 'd' && !cell.z && o && o.dateNF) cell.z = o.dateNF;
-	if(v == undefined) return safe_format_cell(cell, cell.v);
-	return safe_format_cell(cell, v);
+	if(v == undefined) return safe_format_cell(cell, cell.v, o);
+	return safe_format_cell(cell, v, o);
 }
 
 function sheet_to_json(sheet/*:Worksheet*/, opts/*:?Sheet2JSONOpts*/){
@@ -102,7 +103,7 @@ function sheet_to_json(sheet/*:Worksheet*/, opts/*:?Sheet2JSONOpts*/){
 			case 3: hdr[C] = o.header[C - r.s.c]; break;
 			default:
 				if(val == null) continue;
-				vv = v = format_cell(val);
+				vv = v = format_cell(val, null, o);
 				var counter = 0;
 				for(var CC = 0; CC < hdr.length; ++CC) if(hdr[CC] == vv) vv = v + "_" + (++counter);
 				hdr[C] = vv;
@@ -138,19 +139,17 @@ function sheet_to_json(sheet/*:Worksheet*/, opts/*:?Sheet2JSONOpts*/){
 					else if(raw && v === null) row[hdr[C]] = null;
 					else continue;
 				} else {
-					row[hdr[C]] = raw ? v : format_cell(val,v);
+					row[hdr[C]] = raw ? v : format_cell(val,v,o);
 				}
 				isempty = false;
 			}
 		}
-		if(isempty === false || header === 1) out[outi++] = row;
+		if((isempty === false) || (header === 1 ? o.blankrows !== false : !!o.blankrows)) out[outi++] = row;
 	}
 	out.length = outi;
 	return out;
 }
 
-function sheet_to_row_object_array(sheet/*:Worksheet*/, opts/*:?Sheet2JSONOpts*/) { return sheet_to_json(sheet, opts != null ? opts : {}); }
-
 function sheet_to_csv(sheet/*:Worksheet*/, opts/*:?Sheet2CSVOpts*/) {
 	var out = "", txt = "", qreg = /"/g;
 	var o = opts == null ? {} : opts;
@@ -158,27 +157,31 @@ function sheet_to_csv(sheet/*:Worksheet*/, opts/*:?Sheet2CSVOpts*/) {
 	var r = safe_decode_range(sheet["!ref"]);
 	var FS = o.FS !== undefined ? o.FS : ",", fs = FS.charCodeAt(0);
 	var RS = o.RS !== undefined ? o.RS : "\n", rs = RS.charCodeAt(0);
-	var endregex = new RegExp(FS+"+$");
+	var endregex = new RegExp((FS=="|" ? "\\|" : FS)+"+$");
 	var row = "", rr = "", cols = [];
 	var i = 0, cc = 0, val;
 	var R = 0, C = 0;
 	for(C = r.s.c; C <= r.e.c; ++C) cols[C] = encode_col(C);
 	for(R = r.s.r; R <= r.e.r; ++R) {
+		var isempty = true;
 		row = "";
 		rr = encode_row(R);
 		for(C = r.s.c; C <= r.e.c; ++C) {
 			val = sheet[cols[C] + rr];
 			if(val == null) txt = "";
 			else if(val.v != null) {
-				txt = ''+format_cell(val);
+				isempty = false;
+				txt = ''+format_cell(val, null, o);
 				for(i = 0, cc = 0; i !== txt.length; ++i) if((cc = txt.charCodeAt(i)) === fs || cc === rs || cc === 34) {
 					txt = "\"" + txt.replace(qreg, '""') + "\""; break; }
 			} else if(val.f != null && !val.F) {
+				isempty = false;
 				txt = '=' + val.f; if(txt.indexOf(",") >= 0) txt = '"' + txt.replace(qreg, '""') + '"';
 			} else txt = "";
 			/* NOTE: Excel CSV does not support array formulae */
 			row += (C === r.s.c ? "" : FS) + txt;
 		}
+		if(o.blankrows === false && isempty) continue;
 		if(o.strip) row = row.replace(endregex,"");
 		out += row + RS;
 	}
@@ -236,8 +239,9 @@ var utils = {
 	make_csv: sheet_to_csv,
 	make_json: sheet_to_json,
 	make_formulae: sheet_to_formulae,
+	aoa_to_sheet: aoa_to_sheet,
 	sheet_to_csv: sheet_to_csv,
 	sheet_to_json: sheet_to_json,
 	sheet_to_formulae: sheet_to_formulae,
-	sheet_to_row_object_array: sheet_to_row_object_array
+	sheet_to_row_object_array: sheet_to_json
 };
diff --git a/bits/98_exports.js b/bits/98_exports.js
index 8e9fd8a..7f5d4d3 100644
--- a/bits/98_exports.js
+++ b/bits/98_exports.js
@@ -9,6 +9,7 @@ XLSX.readFileSync = readFileSync;
 XLSX.write = writeSync;
 XLSX.writeFile = writeFileSync;
 XLSX.writeFileSync = writeFileSync;
+XLSX.writeFileAsync = writeFileAsync;
 XLSX.utils = utils;
 XLSX.CFB = CFB;
 XLSX.SSF = SSF;
diff --git a/docbits/10_install.md b/docbits/10_install.md
index 825189b..91181d1 100644
--- a/docbits/10_install.md
+++ b/docbits/10_install.md
@@ -25,6 +25,7 @@ CDNjs automatically pulls the latest version and makes all versions available at
 
 The `demos` directory includes sample projects for:
 
+- [`angular`](demos/angular/)
 - [`browserify`](demos/browserify/)
 - [`requirejs`](demos/requirejs/)
 - [`systemjs`](demos/systemjs/)
diff --git a/docbits/40_interface.md b/docbits/40_interface.md
index 44ca6c3..073ac83 100644
--- a/docbits/40_interface.md
+++ b/docbits/40_interface.md
@@ -20,12 +20,19 @@ Parse options are described in the [Parsing Options](#parsing-options) section.
 
 `XLSX.writeFile(wb, filename, write_opts)` attempts to write `wb` to `filename`
 
+`XLSX.writeFileAsync(filename, wb, o, cb)` attempts to write `wb` to `filename`.
+If `o` is omitted, the writer will use the third argument as the callback.
+
 Write options are described in the [Writing Options](#writing-options) section.
 
 ### Utilities
 
 Utilities are available in the `XLSX.utils` object:
 
+**Importing:**
+
+- `aoa_to_sheet` converts an array of arrays of JS data to a worksheet.
+
 **Exporting:**
 
 - `sheet_to_json` converts a worksheet object to an array of JSON objects.
diff --git a/docbits/62_columns.md b/docbits/62_columns.md
index 4613e10..adce380 100644
--- a/docbits/62_columns.md
+++ b/docbits/62_columns.md
@@ -17,7 +17,7 @@ objects which have the following properties:
 ```typescript
 type ColInfo = {
 	MDW?:number;  // Excel's "Max Digit Width" unit, always integral
-	width:number; // width in Excel's "Max Digit Width", width*256 is integral 
+	width:number; // width in Excel's "Max Digit Width", width*256 is integral
 	wpx?:number;  // width in screen pixels
 	wch?:number;  // intermediate character calculation
 };
@@ -28,4 +28,5 @@ follow the priority order:
 
 1) use `width` field if available
 2) use `wpx` pixel width if available
-2) use `wch` character count if available
+3) use `wch` character count if available
+
diff --git a/docbits/80_parseopts.md b/docbits/80_parseopts.md
index 439cb9d..4191145 100644
--- a/docbits/80_parseopts.md
+++ b/docbits/80_parseopts.md
@@ -5,7 +5,7 @@ The exported `read` and `readFile` functions accept an options argument:
 | Option Name | Default | Description                                          |
 | :---------- | ------: | :--------------------------------------------------- |
 | type        |         | Input data encoding (see Input Type below)           |
-| cellFormula | true    | Save formulae to the .f field **                     |
+| cellFormula | true    | Save formulae to the .f field                        |
 | cellHTML    | true    | Parse rich text and save HTML to the .h field        |
 | cellNF      | false   | Save number format string to the .z field            |
 | cellStyles  | false   | Save style/theme info to the .s field                |
@@ -20,8 +20,6 @@ The exported `read` and `readFile` functions accept an options argument:
 | password    | ""      | If defined and file is encrypted, use password **    |
 | WTF         | false   | If true, throw errors on unexpected file features ** |
 
-- `cellFormula` option only applies to formats that require extra processing to
-  parse formulae (XLS/XLSB).
 - Even if `cellNF` is false, formatted text will be generated and saved to `.w`
 - In some cases, sheets may be parsed even if `bookSheets` is false.
 - `bookSheets` and `bookProps` combine to give both sets of information
diff --git a/docbits/82_util.md b/docbits/82_util.md
index f354114..2dd456c 100644
--- a/docbits/82_util.md
+++ b/docbits/82_util.md
@@ -2,6 +2,8 @@
 
 The `sheet_to_*` functions accept a worksheet and an optional options object.
 
+The `*_to_sheet` functions accept a data object and an optional options object.
+
 The examples are based on the following worksheet:
 
 ```
@@ -12,6 +14,30 @@ XXX| A | B | C | D | E | F | G |
  3 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
 ```
 
+### Array of Arrays Input
+
+`XLSX.utils.aoa_to_sheet` takes an array of arrays of JS values and returns a
+worksheet resembling the input data.  Numbers, Booleans and Strings are stored
+as the corresponding styles.  Dates are stored as date or numbers.  Array holes
+and explicit `undefined` values are skipped.  `null` values may be stubbed. All
+other values are stored as strings.  The function takes an options argument:
+
+| Option Name |  Default | Description                                         |
+| :---------- | :------: | :-------------------------------------------------- |
+| dateNF      |  fmt 14  | Use specified date format in string output          |
+| cellDates   |  false   | Store dates as type `d` (default is `n`)            |
+| sheetStubs  |  false   | Create cell objects of type `z` for `null` values   |
+
+To generate the example sheet:
+
+```js
+var ws = XLSX.utils.aoa_to_sheet([
+	"SheetJS".split(""),
+	[1,2,3,4,5,6,7],
+	[2,3,4,5,6,7,8]
+]);
+```
+
 ### Formulae Output
 
 `XLSX.utils.sheet_to_formulae` generates an array of commands that represent
@@ -36,8 +62,10 @@ produces CSV output.  The function takes an options argument:
 | RS          |  `"\n"`  | "Record Separator" delimiter between rows           |
 | dateNF      |  fmt 14  | Use specified date format in string output          |
 | strip       |  false   | Remove trailing field separators in each record **  |
+| blankrows   |  true    | Include blank lines in the CSV output               |
 
 - `strip` will remove trailing commas from each line under default `FS/RS`
+- blankrows must be set to `false` to skip blank lines.
 
 For the example sheet:
 
@@ -66,6 +94,7 @@ generate different types of JS objects.  The function takes an options argument:
 | header      |          | Control output format (see table below)             |
 | dateNF      |  fmt 14  | Use specified date format in string output          |
 | defval      |          | Use specified value in place of null or undefined   |
+| blankrows   |    **    | Include blank lines in the output **                |
 
 - `raw` only affects cells which have a format code (`.z`) field or a formatted
   text (`.w`) field.
@@ -77,6 +106,10 @@ generate different types of JS objects.  The function takes an options argument:
 - `null` values are returned when `raw` is true but are skipped when false.
 - If `defval` is not specified, null and undefined values are skipped normally.
   If specified, all null and undefined points will be filled with `defval`
+- When `header` is `1`, the default is to generate blank rows.  `blankrows` must
+  be set to `false` to skip blank rows.
+- When `header` is not `1`, the default is to skip blank rows.  `blankrows` must
+  be truthy to generate blank rows
 
 `range` is expected to be one of:
 
@@ -95,6 +128,9 @@ generate different types of JS objects.  The function takes an options argument:
 | array of strings | Use specified strings as keys in row objects              |
 | (default)        | Read and disambiguate first row as keys                   |
 
+If header is not `1`, the row object will contain the non-enumerable property
+`__rowNum__` that represents the row of the sheet corresponding to the entry.
+
 For the example sheet:
 
 ```js
diff --git a/jszip.js b/jszip.js
index 7155082..9a32d7d 100644
--- a/jszip.js
+++ b/jszip.js
@@ -9,7 +9,7 @@ Dual licenced under the MIT license or GPLv3. See https://raw.github.com/Stuk/js
 JSZip uses the library pako released under the MIT license :
 https://github.com/nodeca/pako/blob/master/LICENSE
 */
-!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd){JSZip=e();define([],e);}else{var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.JSZip=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
+!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd){JSZip=e();define([],e);}else{if(typeof self == 'undefined' && typeof app != 'undefined') self = app;var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.JSZip=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
 'use strict';
 // private property
 var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
@@ -1005,10 +1005,6 @@ var generateZipParts = function(name, file, compressedObject, offset) {
         date = o.date;
     }
 
-    // date
-    // @see http://www.delorie.com/djgpp/doc/rbinter/it/52/13.html
-    // @see http://www.delorie.com/djgpp/doc/rbinter/it/65/16.html
-    // @see http://www.delorie.com/djgpp/doc/rbinter/it/66/16.html
 
     dosTime = date.getHours();
     dosTime = dosTime << 6;
diff --git a/misc/flow.js b/misc/flow.js
index feeb605..ca5f74f 100644
--- a/misc/flow.js
+++ b/misc/flow.js
@@ -25,6 +25,7 @@ interface CellAddress {
 	r:number;
 	c:number;
 };
+type CellAddrSpec = CellAddress | string;
 
 type Cell = any;
 
@@ -66,4 +67,6 @@ type ColInfo = {
 	wpx?:number;  // width in screen pixels
 	wch?:number;  // intermediate character calculation
 };
+
+type AOA = Array<Array<any> >;
 */
diff --git a/shim.js b/shim.js
index 730708d..2a2d626 100644
--- a/shim.js
+++ b/shim.js
@@ -242,7 +242,7 @@ if (typeof ArrayBuffer !== 'undefined' && !ArrayBuffer.prototype.slice) {
 
 ;(function () {
 
-  var object = typeof exports != 'undefined' ? exports : self; // #8: web workers
+  var object = typeof exports != 'undefined' ? exports : typeof self != 'undefined' ? self : (1,eval)("this");
   var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
 
   function InvalidCharacterError(message) {
@@ -279,7 +279,7 @@ if (typeof ArrayBuffer !== 'undefined' && !ArrayBuffer.prototype.slice) {
   // [https://gist.github.com/1020396] by [https://github.com/atk]
   object.atob || (
   object.atob = function (input) {
-    var str = String(input).replace(/=+$/, '');
+    var str = String(input).replace(new RegExp("=+$"), '');
     if (str.length % 4 == 1) {
       throw new InvalidCharacterError("'atob' failed: The string to be decoded is not correctly encoded.");
     }
@@ -299,7 +299,7 @@ if (typeof ArrayBuffer !== 'undefined' && !ArrayBuffer.prototype.slice) {
     }
     return output;
   });
-
+  if(typeof app != 'undefined') { app.btoa = object.btoa; app.atob = object.atob; }
 }());
 
 
diff --git a/test.js b/test.js
index 4ffbbb1..1c2f757 100644
--- a/test.js
+++ b/test.js
@@ -1041,33 +1041,6 @@ function datenum(v/*:Date*/, date1904/*:?boolean*/)/*:number*/ {
 	if(date1904) epoch += 1462*24*60*60*1000;
 	return (epoch + 2209161600000) / (24 * 60 * 60 * 1000);
 }
-function sheet_from_array_of_arrays(data, opts) {
-	var ws = {};
-	var range = {s: {c:10000000, r:10000000}, e: {c:0, r:0 }};
-	for(var R = 0; R != data.length; ++R) {
-		for(var C = 0; C != data[R].length; ++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;
-			if(range.e.c < C) range.e.c = C;
-			var cell = {v: data[R][C] };
-			if(cell.v === undefined) continue;
-			var cell_ref = X.utils.encode_cell({c:C,r:R});
-			if(cell.v === null) cell.t = 'z';
-			else if(typeof cell.v === 'number') cell.t = 'n';
-			else if(typeof cell.v === 'boolean') cell.t = 'b';
-			else if(cell.v instanceof Date) {
-				cell.z = X.SSF._table[14];
-				if(opts && opts.cellDates) cell.t = 'd';
-				else { cell.t = 'n'; cell.v = datenum(cell.v); }
-			}
-			else cell.t = 's';
-			ws[cell_ref] = cell;
-		}
-	}
-	if(range.s.c < 10000000) ws['!ref'] = X.utils.encode_range(range);
-	return ws;
-}
 
 describe('json output', function() {
 	function seeker(json, keys, val) {
@@ -1085,7 +1058,7 @@ describe('json output', function() {
 			["foo", "bar", new Date("2014-02-19T14:30Z"), "0.3"],
 			["baz", undefined, "qux"]
 		];
-		ws = sheet_from_array_of_arrays(data);
+		ws = X.utils.aoa_to_sheet(data);
 	});
 	if(typeof before != 'undefined') before(bef);
 	else it('before', bef);
@@ -1142,8 +1115,6 @@ describe('json output', function() {
 	});
 	it('should use defval if requested', function() {
 		var json = X.utils.sheet_to_json(ws, {defval: 'jimjin'});
-		console.log(json);
-		console.log(ws);
 		assert.equal(json.length, data.length - 1);
 		assert.equal(json[0][1], "TRUE");
 		assert.equal(json[1][2], "bar");
@@ -1153,13 +1124,11 @@ describe('json output', function() {
 		assert.doesNotThrow(function() { seeker(json, [1,2,3], "sheetjs"); });
 		assert.throws(function() { seeker(json, [1,2,3], "baz"); });
 		var json = X.utils.sheet_to_json(ws, {raw:true});
-		console.log(json);
 		var json = X.utils.sheet_to_json(ws, {raw:true, defval: 'jimjin'});
-		console.log(json);
 	});
 	it('should disambiguate headers', function() {
 		var _data = [["S","h","e","e","t","J","S"],[1,2,3,4,5,6,7],[2,3,4,5,6,7,8]];
-		var _ws = sheet_from_array_of_arrays(_data);
+		var _ws = X.utils.aoa_to_sheet(_data);
 		var json = X.utils.sheet_to_json(_ws);
 		for(var i = 0; i < json.length; ++i) {
 			assert.equal(json[i].S,   1 + i);
@@ -1172,7 +1141,7 @@ describe('json output', function() {
 		}
 	});
 	it('should handle raw data if requested', function() {
-		var _ws = sheet_from_array_of_arrays(data, {cellDates:true});
+		var _ws = X.utils.aoa_to_sheet(data, {cellDates:true});
 		var json = X.utils.sheet_to_json(_ws, {header:1, raw:true});
 		assert.equal(json.length, data.length);
 		assert.equal(json[1][0], true);
@@ -1181,6 +1150,72 @@ describe('json output', function() {
 		assert.equal(json[2][2].getTime(), new Date("2014-02-19T14:30Z").getTime());
 		assert.equal(json[3][2], "qux");
 	});
+	it('should include __rowNum__', function() {
+		var _data = [["S","h","e","e","t","J","S"],[1,2,3,4,5,6,7],[],[2,3,4,5,6,7,8]];
+		var _ws = X.utils.aoa_to_sheet(_data);
+		var json = X.utils.sheet_to_json(_ws);
+		assert.equal(json[0].__rowNum__, 1);
+		assert.equal(json[1].__rowNum__, 3);
+	});
+	it('should handle blankrows', function() {
+		var _data = [["S","h","e","e","t","J","S"],[1,2,3,4,5,6,7],[],[2,3,4,5,6,7,8]];
+		var _ws = X.utils.aoa_to_sheet(_data);
+		var json1 = X.utils.sheet_to_json(_ws);
+		var json2 = X.utils.sheet_to_json(_ws, {header:1});
+		var json3 = X.utils.sheet_to_json(_ws, {blankrows:true});
+		var json4 = X.utils.sheet_to_json(_ws, {blankrows:true, header:1});
+		var json5 = X.utils.sheet_to_json(_ws, {blankrows:false});
+		var json6 = X.utils.sheet_to_json(_ws, {blankrows:false, header:1});
+		assert.equal(json1.length, 2); // = 2 non-empty records
+		assert.equal(json2.length, 4); // = 4 sheet rows
+		assert.equal(json3.length, 3); // = 2 records + 1 blank row
+		assert.equal(json4.length, 4); // = 4 sheet rows
+		assert.equal(json5.length, 2); // = 2 records
+		assert.equal(json6.length, 3); // = 4 sheet rows - 1 blank row
+	});
+});
+
+describe('csv output', function() {
+	var data, ws;
+	var bef = (function() {
+		data = [
+			[1,2,3,null],
+			[true, false, null, "sheetjs"],
+			["foo", "bar", new Date("2014-02-19T14:30Z"), "0.3"],
+			[null, null, null],
+			["baz", undefined, "qux"]
+		];
+		ws = X.utils.aoa_to_sheet(data);
+	});
+	if(typeof before != 'undefined') before(bef);
+	else it('before', bef);
+	it('should generate csv', function() {
+		var baseline = "1,2,3,\nTRUE,FALSE,,sheetjs\nfoo,bar,2/19/14,0.3\n,,,\nbaz,,qux,\n";
+		assert.equal(baseline, X.utils.sheet_to_csv(ws));
+	});
+	it('should handle FS', function() {
+		assert.equal(X.utils.sheet_to_csv(ws, {FS:"|"}).replace(/[|]/g,","), X.utils.sheet_to_csv(ws));
+		assert.equal(X.utils.sheet_to_csv(ws, {FS:";"}).replace(/[;]/g,","), X.utils.sheet_to_csv(ws));
+	});
+	it('should handle RS', function() {
+		assert.equal(X.utils.sheet_to_csv(ws, {RS:"|"}).replace(/[|]/g,"\n"), X.utils.sheet_to_csv(ws));
+		assert.equal(X.utils.sheet_to_csv(ws, {RS:";"}).replace(/[;]/g,"\n"), X.utils.sheet_to_csv(ws));
+	});
+	it('should handle dateNF', function() {
+		var baseline = "1,2,3,\nTRUE,FALSE,,sheetjs\nfoo,bar,20140219,0.3\n,,,\nbaz,,qux,\n";
+		var _ws =  X.utils.aoa_to_sheet(data, {cellDates:true});
+		delete _ws.C3.w;
+		delete _ws.C3.z;
+		assert.equal(baseline, X.utils.sheet_to_csv(_ws, {dateNF:"YYYYMMDD"}));
+	});
+	it('should handle strip', function() {
+		var baseline = "1,2,3\nTRUE,FALSE,,sheetjs\nfoo,bar,2/19/14,0.3\n\nbaz,,qux\n";
+		assert.equal(baseline, X.utils.sheet_to_csv(ws, {strip:true}));
+	});
+	it('should handle blankrows', function() {
+		var baseline = "1,2,3,\nTRUE,FALSE,,sheetjs\nfoo,bar,2/19/14,0.3\nbaz,,qux,\n";
+		assert.equal(baseline, X.utils.sheet_to_csv(ws, {blankrows:false}));
+	});
 });
 
 describe('js -> file -> js', function() {
@@ -1192,7 +1227,7 @@ describe('js -> file -> js', function() {
 			["foo","bar",new Date("2014-02-19T14:30Z"), "0.3"],
 			["baz", 6.9, "qux"]
 		];
-		ws = sheet_from_array_of_arrays(data);
+		ws = X.utils.aoa_to_sheet(data);
 		wb = { SheetNames: ['Sheet1'], Sheets: {Sheet1: ws} };
 	});
 	if(typeof before != 'undefined') before(bef);
@@ -1234,7 +1269,7 @@ describe('corner cases', function() {
 			["foo","bar",new Date("2014-02-19T14:30Z"), "0.3"],
 			["baz", null, "q\"ux"]
 		];
-		var ws = sheet_from_array_of_arrays(data);
+		var ws = X.utils.aoa_to_sheet(data);
 		ws.A1.f = ""; ws.A1.w = "";
 		delete ws.C3.w; delete ws.C3.z; ws.C3.XF = {ifmt:14};
 		ws.A4.t = "e";
diff --git a/xlsx.flow.js b/xlsx.flow.js
index 3b2dcc8..da1a13b 100644
--- a/xlsx.flow.js
+++ b/xlsx.flow.js
@@ -444,7 +444,7 @@ function write_num_flt(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 	if(fmt.charCodeAt(fmt.length - 1) === 44) return write_num_cm(type, fmt, val);
 	if(fmt.indexOf('%') !== -1) return write_num_pct(type, fmt, val);
 	if(fmt.indexOf('E') !== -1) return write_num_exp(fmt, val);
-	if(fmt.charCodeAt(0) === 36) return "$"+write_num_flt(type,fmt.substr(fmt[1]==' '?2:1),val);
+	if(fmt.charCodeAt(0) === 36) return "$"+write_num_flt(type,fmt.substr(fmt.charAt(1)==' '?2:1),val);
 	var o;
 	var r/*:?Array<string>*/, ri, ff, aval = Math.abs(val), sign = val < 0 ? "-" : "";
 	if(fmt.match(/^00+$/)) return sign + pad0r(aval,fmt.length);
@@ -470,7 +470,7 @@ function write_num_flt(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 	if((r = fmt.match(/^([0#]+)(\\?-([0#]+))+$/))) {
 		o = _strrev(write_num_flt(type, fmt.replace(/[\\-]/g,""), val));
 		ri = 0;
-		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o[ri++]:x==='0'?'0':"";}));
+		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o.charAt(ri++):x==='0'?'0':"";}));
 	}
 	if(fmt.match(phone)) {
 		o = write_num_flt(type, "##########", val);
@@ -482,7 +482,7 @@ function write_num_flt(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 		ff = frac(aval, Math.pow(10,ri)-1, false);
 		o = "" + sign;
 		oa = write_num("n", /*::String(*/r[1]/*::)*/, ff[1]);
-		if(oa[oa.length-1] == " ") oa = oa.substr(0,oa.length-1) + "0";
+		if(oa.charAt(oa.length-1) == " ") oa = oa.substr(0,oa.length-1) + "0";
 		o += oa + /*::String(*/r[2]/*::)*/ + "/" + /*::String(*/r[3]/*::)*/;
 		oa = rpad_(ff[2],ri);
 		if(oa.length < r[4].length) oa = hashq(r[4].substr(r[4].length-oa.length)) + oa;
@@ -553,7 +553,7 @@ function write_num_int(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 	if(fmt.charCodeAt(fmt.length - 1) === 44) return write_num_cm2(type, fmt, val);
 	if(fmt.indexOf('%') !== -1) return write_num_pct2(type, fmt, val);
 	if(fmt.indexOf('E') !== -1) return write_num_exp2(fmt, val);
-	if(fmt.charCodeAt(0) === 36) return "$"+write_num_int(type,fmt.substr(fmt[1]==' '?2:1),val);
+	if(fmt.charCodeAt(0) === 36) return "$"+write_num_int(type,fmt.substr(fmt.charAt(1)==' '?2:1),val);
 	var o;
 	var r, ri, ff, aval = Math.abs(val), sign = val < 0 ? "-" : "";
 	if(fmt.match(/^00+$/)) return sign + pad0(aval,fmt.length);
@@ -583,7 +583,7 @@ function write_num_int(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 	if((r = fmt.match(/^([0#]+)(\\?-([0#]+))+$/))) {
 		o = _strrev(write_num_int(type, fmt.replace(/[\\-]/g,""), val));
 		ri = 0;
-		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o[ri++]:x==='0'?'0':"";}));
+		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o.charAt(ri++):x==='0'?'0':"";}));
 	}
 	if(fmt.match(phone)) {
 		o = write_num_int(type, "##########", val);
@@ -595,7 +595,7 @@ function write_num_int(type/*:string*/, fmt/*:string*/, val/*:number*/)/*:string
 		ff = frac(aval, Math.pow(10,ri)-1, false);
 		o = "" + sign;
 		oa = write_num("n", r[1], ff[1]);
-		if(oa[oa.length-1] == " ") oa = oa.substr(0,oa.length-1) + "0";
+		if(oa.charAt(oa.length-1) == " ") oa = oa.substr(0,oa.length-1) + "0";
 		o += oa + r[2] + "/" + r[3];
 		oa = rpad_(ff[2],ri);
 		if(oa.length < r[4].length) oa = hashq(r[4].substr(r[4].length-oa.length)) + oa;
@@ -847,7 +847,7 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 				j=out[i].v.indexOf(".")>-1&&i===decpt?out[i].v.indexOf(".")-1:out[i].v.length-1;
 				vv = out[i].v.substr(j+1);
 				for(; j>=0; --j) {
-					if(jj>=0 && (out[i].v[j] === "0" || out[i].v[j] === "#")) vv = ostr[jj--] + vv;
+					if(jj>=0 && (out[i].v.charAt(j) === "0" || out[i].v.charAt(j) === "#")) vv = ostr.charAt(jj--) + vv;
 				}
 				out[i].v = vv;
 				out[i].t = 't';
@@ -860,7 +860,7 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 				j=out[i].v.indexOf(".")>-1&&i===decpt?out[i].v.indexOf(".")+1:0;
 				vv = out[i].v.substr(0,j);
 				for(; j<out[i].v.length; ++j) {
-					if(jj<ostr.length) vv += ostr[jj++];
+					if(jj<ostr.length) vv += ostr.charAt(jj++);
 				}
 				out[i].v = vv;
 				out[i].t = 't';
@@ -1401,6 +1401,18 @@ function datenum(v/*:Date*/, date1904/*:?boolean*/)/*:number*/ {
 	if(date1904) epoch += 1462*24*60*60*1000;
 	return (epoch + 2209161600000) / (24 * 60 * 60 * 1000);
 }
+function numdate(v/*:number*/)/*:Date*/ {
+	var date = SSF.parse_date_code(v);
+	var val = new Date();
+	if(date == null) throw new Error("Bad Date Code: " + v);
+	val.setUTCDate(date.d);
+	val.setUTCMonth(date.m-1);
+	val.setUTCFullYear(date.y);
+	val.setUTCHours(date.H);
+	val.setUTCMinutes(date.M);
+	val.setUTCSeconds(date.S);
+	return val;
+}
 
 /* ISO 8601 Duration */
 function parse_isodur(s) {
@@ -2049,6 +2061,42 @@ var make_offcrypto = function(O, _crypto) {
 /*:: declare var crypto:any; */
 make_offcrypto(OFFCRYPTO, typeof crypto !== "undefined" ? crypto : undefined);
 
+function sheet_to_workbook(sheet/*:Worksheet*/, opts)/*:Workbook*/ {
+	var n = opts && opts.sheet ? opts.sheet : "Sheet1";
+	var sheets = {}; sheets[n] = sheet;
+	return { SheetNames: [n], Sheets: sheets };
+}
+
+function aoa_to_sheet(data/*:AOA*/, opts/*:?any*/)/*:Worksheet*/ {
+	var o = opts || {};
+	var ws/*:Worksheet*/ = ({}/*:any*/);
+	var range/*:Range*/ = ({s: {c:10000000, r:10000000}, e: {c:0, r:0}}/*:any*/);
+	for(var R = 0; R != data.length; ++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*/);
+			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;
+			if(range.e.c < C) range.e.c = C;
+			var cell_ref = encode_cell(({c:C,r:R}/*:any*/));
+			if(cell.v === null) { if(!o.cellStubs) continue; cell.t = 'z'; }
+			else if(typeof cell.v === 'number') cell.t = 'n';
+			else if(typeof cell.v === 'boolean') cell.t = 'b';
+			else if(cell.v instanceof Date) {
+				cell.z = o.dateNF || SSF._table[14];
+				if(o.cellDates) cell.t = 'd';
+				else { cell.t = 'n'; cell.v = datenum(cell.v); }
+				cell.w = SSF.format(cell.z, cell.v);
+			}
+			else cell.t = 's';
+			ws[cell_ref] = cell;
+		}
+	}
+	if(range.s.c < 10000000) ws['!ref'] = encode_range(range);
+	return ws;
+}
+
 
 /* [MS-XLSB] 2.5.143 */
 function parse_StrRun(data, length/*:?number*/) {
@@ -5389,7 +5437,7 @@ function parse_numFmts(t, styles, opts) {
 
 function write_numFmts(NF/*:{[n:number]:string}*/, opts) {
 	var o = ["<numFmts>"];
-	[[5,8],[23,26],[41,44],[63,66],[164,392]].forEach(function(r) {
+	[[5,8],[23,26],[41,44],[/*63*/50,/*66],[164,*/392]].forEach(function(r) {
 		for(var i = r[0]; i <= r[1]; ++i) if(NF[i] != null) o[o.length] = (writextag('numFmt',null,{numFmtId:i,formatCode:escapexml(NF[i])}));
 	});
 	if(o.length === 1) return "";
@@ -7029,18 +7077,18 @@ function stringify_formula(formula/*Array<any>*/, range, cell/*:any*/, supbooks,
 			/* 2.5.198.31 TODO */
 			case 'PtgAreaN':
 				type = f[1][0]; r = shift_range_xls(f[1][1], _range, opts);
-				stack.push(encode_range_xls(r, opts));
+				stack.push(encode_range_xls((r/*:any*/), opts));
 				break;
 			/* 2.5.198.27 TODO: fixed points */
 			case 'PtgArea':
 				type = f[1][0]; r = shift_range_xls(f[1][1], _range, opts);
-				stack.push(encode_range_xls(r, opts));
+				stack.push(encode_range_xls((r/*:any*/), opts));
 				break;
 			/* 2.5.198.28 */
 			case 'PtgArea3d': // TODO: lots of stuff
 				type = f[1][0]; ixti = /*::Number(*/f[1][1]/*::)*/; r = f[1][2];
 				sname = (supbooks && supbooks[1] ? supbooks[1][ixti+1] : "**MISSING**");
-				stack.push(sname + "!" + encode_range(r));
+				stack.push(sname + "!" + encode_range((r/*:any*/)));
 				break;
 			/* 2.5.198.41 */
 			case 'PtgAttrSum':
@@ -10225,6 +10273,7 @@ function xlml_normalize(d)/*:string*/ {
 var xlmlregex = /<(\/?)([^\s?>!\/:]*:|)([^\s?>]*[^\s?>\/])[^>]*>/mg;
 //var xlmlregex = /<(\/?)([a-z0-9]*:|)(\w+)[^>]*>/mg;
 function parse_xlml_xml(d, opts)/*:Workbook*/ {
+	make_ssf(SSF);
 	var str = debom(xlml_normalize(d));
 	if(opts && opts.type == 'binary' && typeof cptable !== 'undefined') str = cptable.utils.decode(65001, char_codes(str));
 	if(str.substr(0,1000).indexOf("<html") >= 0) return parse_html(str, opts);
@@ -10335,7 +10384,10 @@ function parse_xlml_xml(d, opts)/*:Workbook*/ {
 			break;
 
 		case 'NumberFormat':
-			stag.nf = xlml_parsexmltag(Rn[0]).Format || "General";
+			stag.nf = unescapexml(xlml_parsexmltag(Rn[0]).Format || "General");
+			if(XLMLFormatMap[stag.nf]) stag.nf = XLMLFormatMap[stag.nf];
+			for(var ssfidx = 0; ssfidx != 0x188; ++ssfidx) if(SSF._table[ssfidx] == stag.nf) break;
+			if(ssfidx == 0x188) for(ssfidx = 0x39; ssfidx != 0x188; ++ssfidx) if(SSF._table[ssfidx] == null) { SSF.load(stag.nf, ssfidx); break; }
 			break;
 
 		case 'Column':
@@ -11012,7 +11064,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 	var out = {};
 	var Directory = {};
 	var found_sheet = false;
-	var range = {};
+	var range/*:Range*/ = ({}/*:any*/);
 	var last_formula = null;
 	var sst = [];
 	var cur_sheet = "";
@@ -13977,9 +14029,7 @@ function writeSync(wb/*:Workbook*/, opts/*:?WriteOpts*/) {
 	}
 }
 
-function writeFileSync(wb/*:Workbook*/, filename/*:string*/, opts/*:?WriteFileOpts*/) {
-	var o = opts||{}; o.type = 'file';
-	o.file = filename;
+function resolve_book_type(o/*?WriteFileOpts*/) {
 	if(!o.bookType) switch(o.file.slice(-5).toLowerCase()) {
 		case '.xlsx': o.bookType = 'xlsx'; break;
 		case '.xlsm': o.bookType = 'xlsm'; break;
@@ -13992,9 +14042,23 @@ function writeFileSync(wb/*:Workbook*/, filename/*:string*/, opts/*:?WriteFileOp
 		case '.ods': o.bookType = 'ods'; break;
 		case '.csv': o.bookType = 'csv'; break;
 	}}
+}
+
+function writeFileSync(wb/*:Workbook*/, filename/*:string*/, opts/*:?WriteFileOpts*/) {
+	var o = opts||{}; o.type = 'file';
+	o.file = filename;
+	resolve_book_type(o);
 	return writeSync(wb, o);
 }
 
+function writeFileAsync(filename/*:string*/, wb/*:Workbook*/, opts/*:?WriteFileOpts*/, cb/*:?(e?:ErrnoError)=>void*/) {
+	var o = opts||{}; o.type = 'file';
+	o.file = filename;
+	resolve_book_type(o);
+	o.type = 'buffer';
+	var _cb = cb; if(!(_cb instanceof Function)) _cb = (opts/*:any*/);
+	return _fs.writeFile(filename, writeSync(wb, o), _cb);
+}
 function decode_row(rowstr/*:string*/)/*:number*/ { return parseInt(unfix_row(rowstr),10) - 1; }
 function encode_row(row/*:number*/)/*:string*/ { return "" + (row + 1); }
 function fix_row(cstr/*:string*/)/*:string*/ { return cstr.replace(/([A-Z]|^)(\d+)$/,"$1$$$2"); }
@@ -14011,7 +14075,8 @@ function encode_cell(cell/*:CellAddress*/)/*:string*/ { return encode_col(cell.c
 function fix_cell(cstr/*:string*/)/*:string*/ { return fix_col(fix_row(cstr)); }
 function unfix_cell(cstr/*:string*/)/*:string*/ { return unfix_col(unfix_row(cstr)); }
 function decode_range(range/*:string*/)/*:Range*/ { var x =range.split(":").map(decode_cell); return {s:x[0],e:x[x.length-1]}; }
-function encode_range(cs/*:any*/,ce/*:?any*/)/*:string*/ {
+/*# if only one arg, it is assumed to be a Range.  If 2 args, both are cell addresses */
+function encode_range(cs/*:CellAddrSpec|Range*/,ce/*:?CellAddrSpec*/)/*:string*/ {
 	if(typeof ce === 'undefined' || typeof ce === 'number') {
 /*:: if(!(cs instanceof Range)) throw "unreachable"; */
 		return encode_range(cs.s, cs.e);
@@ -14066,8 +14131,8 @@ function format_cell(cell/*:Cell*/, v/*:any*/, o/*:any*/) {
 	if(cell == null || cell.t == null || cell.t == 'z') return "";
 	if(cell.w !== undefined) return cell.w;
 	if(cell.t == 'd' && !cell.z && o && o.dateNF) cell.z = o.dateNF;
-	if(v == undefined) return safe_format_cell(cell, cell.v);
-	return safe_format_cell(cell, v);
+	if(v == undefined) return safe_format_cell(cell, cell.v, o);
+	return safe_format_cell(cell, v, o);
 }
 
 function sheet_to_json(sheet/*:Worksheet*/, opts/*:?Sheet2JSONOpts*/){
@@ -14099,7 +14164,7 @@ function sheet_to_json(sheet/*:Worksheet*/, opts/*:?Sheet2JSONOpts*/){
 			case 3: hdr[C] = o.header[C - r.s.c]; break;
 			default:
 				if(val == null) continue;
-				vv = v = format_cell(val);
+				vv = v = format_cell(val, null, o);
 				var counter = 0;
 				for(var CC = 0; CC < hdr.length; ++CC) if(hdr[CC] == vv) vv = v + "_" + (++counter);
 				hdr[C] = vv;
@@ -14135,19 +14200,17 @@ function sheet_to_json(sheet/*:Worksheet*/, opts/*:?Sheet2JSONOpts*/){
 					else if(raw && v === null) row[hdr[C]] = null;
 					else continue;
 				} else {
-					row[hdr[C]] = raw ? v : format_cell(val,v);
+					row[hdr[C]] = raw ? v : format_cell(val,v,o);
 				}
 				isempty = false;
 			}
 		}
-		if(isempty === false || header === 1) out[outi++] = row;
+		if((isempty === false) || (header === 1 ? o.blankrows !== false : !!o.blankrows)) out[outi++] = row;
 	}
 	out.length = outi;
 	return out;
 }
 
-function sheet_to_row_object_array(sheet/*:Worksheet*/, opts/*:?Sheet2JSONOpts*/) { return sheet_to_json(sheet, opts != null ? opts : {}); }
-
 function sheet_to_csv(sheet/*:Worksheet*/, opts/*:?Sheet2CSVOpts*/) {
 	var out = "", txt = "", qreg = /"/g;
 	var o = opts == null ? {} : opts;
@@ -14155,27 +14218,31 @@ function sheet_to_csv(sheet/*:Worksheet*/, opts/*:?Sheet2CSVOpts*/) {
 	var r = safe_decode_range(sheet["!ref"]);
 	var FS = o.FS !== undefined ? o.FS : ",", fs = FS.charCodeAt(0);
 	var RS = o.RS !== undefined ? o.RS : "\n", rs = RS.charCodeAt(0);
-	var endregex = new RegExp(FS+"+$");
+	var endregex = new RegExp((FS=="|" ? "\\|" : FS)+"+$");
 	var row = "", rr = "", cols = [];
 	var i = 0, cc = 0, val;
 	var R = 0, C = 0;
 	for(C = r.s.c; C <= r.e.c; ++C) cols[C] = encode_col(C);
 	for(R = r.s.r; R <= r.e.r; ++R) {
+		var isempty = true;
 		row = "";
 		rr = encode_row(R);
 		for(C = r.s.c; C <= r.e.c; ++C) {
 			val = sheet[cols[C] + rr];
 			if(val == null) txt = "";
 			else if(val.v != null) {
-				txt = ''+format_cell(val);
+				isempty = false;
+				txt = ''+format_cell(val, null, o);
 				for(i = 0, cc = 0; i !== txt.length; ++i) if((cc = txt.charCodeAt(i)) === fs || cc === rs || cc === 34) {
 					txt = "\"" + txt.replace(qreg, '""') + "\""; break; }
 			} else if(val.f != null && !val.F) {
+				isempty = false;
 				txt = '=' + val.f; if(txt.indexOf(",") >= 0) txt = '"' + txt.replace(qreg, '""') + '"';
 			} else txt = "";
 			/* NOTE: Excel CSV does not support array formulae */
 			row += (C === r.s.c ? "" : FS) + txt;
 		}
+		if(o.blankrows === false && isempty) continue;
 		if(o.strip) row = row.replace(endregex,"");
 		out += row + RS;
 	}
@@ -14233,10 +14300,11 @@ var utils = {
 	make_csv: sheet_to_csv,
 	make_json: sheet_to_json,
 	make_formulae: sheet_to_formulae,
+	aoa_to_sheet: aoa_to_sheet,
 	sheet_to_csv: sheet_to_csv,
 	sheet_to_json: sheet_to_json,
 	sheet_to_formulae: sheet_to_formulae,
-	sheet_to_row_object_array: sheet_to_row_object_array
+	sheet_to_row_object_array: sheet_to_json
 };
 XLSX.parse_xlscfb = parse_xlscfb;
 XLSX.parse_ods = parse_ods;
@@ -14249,6 +14317,7 @@ XLSX.readFileSync = readFileSync;
 XLSX.write = writeSync;
 XLSX.writeFile = writeFileSync;
 XLSX.writeFileSync = writeFileSync;
+XLSX.writeFileAsync = writeFileAsync;
 XLSX.utils = utils;
 XLSX.CFB = CFB;
 XLSX.SSF = SSF;
diff --git a/xlsx.js b/xlsx.js
index 0b2d30b..4adcc7b 100644
--- a/xlsx.js
+++ b/xlsx.js
@@ -425,7 +425,7 @@ function write_num_flt(type, fmt, val) {
 	if(fmt.charCodeAt(fmt.length - 1) === 44) return write_num_cm(type, fmt, val);
 	if(fmt.indexOf('%') !== -1) return write_num_pct(type, fmt, val);
 	if(fmt.indexOf('E') !== -1) return write_num_exp(fmt, val);
-	if(fmt.charCodeAt(0) === 36) return "$"+write_num_flt(type,fmt.substr(fmt[1]==' '?2:1),val);
+	if(fmt.charCodeAt(0) === 36) return "$"+write_num_flt(type,fmt.substr(fmt.charAt(1)==' '?2:1),val);
 	var o;
 	var r, ri, ff, aval = Math.abs(val), sign = val < 0 ? "-" : "";
 	if(fmt.match(/^00+$/)) return sign + pad0r(aval,fmt.length);
@@ -451,7 +451,7 @@ function write_num_flt(type, fmt, val) {
 	if((r = fmt.match(/^([0#]+)(\\?-([0#]+))+$/))) {
 		o = _strrev(write_num_flt(type, fmt.replace(/[\\-]/g,""), val));
 		ri = 0;
-		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o[ri++]:x==='0'?'0':"";}));
+		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o.charAt(ri++):x==='0'?'0':"";}));
 	}
 	if(fmt.match(phone)) {
 		o = write_num_flt(type, "##########", val);
@@ -463,7 +463,7 @@ function write_num_flt(type, fmt, val) {
 		ff = frac(aval, Math.pow(10,ri)-1, false);
 		o = "" + sign;
 		oa = write_num("n", r[1], ff[1]);
-		if(oa[oa.length-1] == " ") oa = oa.substr(0,oa.length-1) + "0";
+		if(oa.charAt(oa.length-1) == " ") oa = oa.substr(0,oa.length-1) + "0";
 		o += oa + r[2] + "/" + r[3];
 		oa = rpad_(ff[2],ri);
 		if(oa.length < r[4].length) oa = hashq(r[4].substr(r[4].length-oa.length)) + oa;
@@ -534,7 +534,7 @@ function write_num_int(type, fmt, val) {
 	if(fmt.charCodeAt(fmt.length - 1) === 44) return write_num_cm2(type, fmt, val);
 	if(fmt.indexOf('%') !== -1) return write_num_pct2(type, fmt, val);
 	if(fmt.indexOf('E') !== -1) return write_num_exp2(fmt, val);
-	if(fmt.charCodeAt(0) === 36) return "$"+write_num_int(type,fmt.substr(fmt[1]==' '?2:1),val);
+	if(fmt.charCodeAt(0) === 36) return "$"+write_num_int(type,fmt.substr(fmt.charAt(1)==' '?2:1),val);
 	var o;
 	var r, ri, ff, aval = Math.abs(val), sign = val < 0 ? "-" : "";
 	if(fmt.match(/^00+$/)) return sign + pad0(aval,fmt.length);
@@ -562,7 +562,7 @@ return "." + $1 + fill("0", r[1].length-$1.length); });
 	if((r = fmt.match(/^([0#]+)(\\?-([0#]+))+$/))) {
 		o = _strrev(write_num_int(type, fmt.replace(/[\\-]/g,""), val));
 		ri = 0;
-		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o[ri++]:x==='0'?'0':"";}));
+		return _strrev(_strrev(fmt.replace(/\\/g,"")).replace(/[0#]/g,function(x){return ri<o.length?o.charAt(ri++):x==='0'?'0':"";}));
 	}
 	if(fmt.match(phone)) {
 		o = write_num_int(type, "##########", val);
@@ -574,7 +574,7 @@ return "." + $1 + fill("0", r[1].length-$1.length); });
 		ff = frac(aval, Math.pow(10,ri)-1, false);
 		o = "" + sign;
 		oa = write_num("n", r[1], ff[1]);
-		if(oa[oa.length-1] == " ") oa = oa.substr(0,oa.length-1) + "0";
+		if(oa.charAt(oa.length-1) == " ") oa = oa.substr(0,oa.length-1) + "0";
 		o += oa + r[2] + "/" + r[3];
 		oa = rpad_(ff[2],ri);
 		if(oa.length < r[4].length) oa = hashq(r[4].substr(r[4].length-oa.length)) + oa;
@@ -823,7 +823,7 @@ out[i].v = write_date(out[i].t.charCodeAt(0), out[i].v, dt, ss0);
 				j=out[i].v.indexOf(".")>-1&&i===decpt?out[i].v.indexOf(".")-1:out[i].v.length-1;
 				vv = out[i].v.substr(j+1);
 				for(; j>=0; --j) {
-					if(jj>=0 && (out[i].v[j] === "0" || out[i].v[j] === "#")) vv = ostr[jj--] + vv;
+					if(jj>=0 && (out[i].v.charAt(j) === "0" || out[i].v.charAt(j) === "#")) vv = ostr.charAt(jj--) + vv;
 				}
 				out[i].v = vv;
 				out[i].t = 't';
@@ -836,7 +836,7 @@ out[i].v = write_date(out[i].t.charCodeAt(0), out[i].v, dt, ss0);
 				j=out[i].v.indexOf(".")>-1&&i===decpt?out[i].v.indexOf(".")+1:0;
 				vv = out[i].v.substr(0,j);
 				for(; j<out[i].v.length; ++j) {
-					if(jj<ostr.length) vv += ostr[jj++];
+					if(jj<ostr.length) vv += ostr.charAt(jj++);
 				}
 				out[i].v = vv;
 				out[i].t = 't';
@@ -1353,6 +1353,18 @@ function datenum(v, date1904) {
 	if(date1904) epoch += 1462*24*60*60*1000;
 	return (epoch + 2209161600000) / (24 * 60 * 60 * 1000);
 }
+function numdate(v) {
+	var date = SSF.parse_date_code(v);
+	var val = new Date();
+	if(date == null) throw new Error("Bad Date Code: " + v);
+	val.setUTCDate(date.d);
+	val.setUTCMonth(date.m-1);
+	val.setUTCFullYear(date.y);
+	val.setUTCHours(date.H);
+	val.setUTCMinutes(date.M);
+	val.setUTCSeconds(date.S);
+	return val;
+}
 
 /* ISO 8601 Duration */
 function parse_isodur(s) {
@@ -1997,6 +2009,42 @@ var make_offcrypto = function(O, _crypto) {
 };
 make_offcrypto(OFFCRYPTO, typeof crypto !== "undefined" ? crypto : undefined);
 
+function sheet_to_workbook(sheet, opts) {
+	var n = opts && opts.sheet ? opts.sheet : "Sheet1";
+	var sheets = {}; sheets[n] = sheet;
+	return { SheetNames: [n], Sheets: sheets };
+}
+
+function aoa_to_sheet(data, opts) {
+	var o = opts || {};
+	var ws = ({});
+	var range = ({s: {c:10000000, r:10000000}, e: {c:0, r:0}});
+	for(var R = 0; R != data.length; ++R) {
+		for(var C = 0; C != data[R].length; ++C) {
+			if(typeof data[R][C] === 'undefined') continue;
+			var cell = ({v: data[R][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;
+			if(range.e.c < C) range.e.c = C;
+			var cell_ref = encode_cell(({c:C,r:R}));
+			if(cell.v === null) { if(!o.cellStubs) continue; cell.t = 'z'; }
+			else if(typeof cell.v === 'number') cell.t = 'n';
+			else if(typeof cell.v === 'boolean') cell.t = 'b';
+			else if(cell.v instanceof Date) {
+				cell.z = o.dateNF || SSF._table[14];
+				if(o.cellDates) cell.t = 'd';
+				else { cell.t = 'n'; cell.v = datenum(cell.v); }
+				cell.w = SSF.format(cell.z, cell.v);
+			}
+			else cell.t = 's';
+			ws[cell_ref] = cell;
+		}
+	}
+	if(range.s.c < 10000000) ws['!ref'] = encode_range(range);
+	return ws;
+}
+
 
 /* [MS-XLSB] 2.5.143 */
 function parse_StrRun(data, length) {
@@ -5335,7 +5383,7 @@ function parse_numFmts(t, styles, opts) {
 
 function write_numFmts(NF, opts) {
 	var o = ["<numFmts>"];
-	[[5,8],[23,26],[41,44],[63,66],[164,392]].forEach(function(r) {
+	[[5,8],[23,26],[41,44],[/*63*/50,/*66],[164,*/392]].forEach(function(r) {
 		for(var i = r[0]; i <= r[1]; ++i) if(NF[i] != null) o[o.length] = (writextag('numFmt',null,{numFmtId:i,formatCode:escapexml(NF[i])}));
 	});
 	if(o.length === 1) return "";
@@ -6974,18 +7022,18 @@ function stringify_formula(formula/*Array<any>*/, range, cell, supbooks, opts) {
 			/* 2.5.198.31 TODO */
 			case 'PtgAreaN':
 				type = f[1][0]; r = shift_range_xls(f[1][1], _range, opts);
-				stack.push(encode_range_xls(r, opts));
+				stack.push(encode_range_xls((r), opts));
 				break;
 			/* 2.5.198.27 TODO: fixed points */
 			case 'PtgArea':
 				type = f[1][0]; r = shift_range_xls(f[1][1], _range, opts);
-				stack.push(encode_range_xls(r, opts));
+				stack.push(encode_range_xls((r), opts));
 				break;
 			/* 2.5.198.28 */
 			case 'PtgArea3d': // TODO: lots of stuff
 				type = f[1][0]; ixti = f[1][1]; r = f[1][2];
 				sname = (supbooks && supbooks[1] ? supbooks[1][ixti+1] : "**MISSING**");
-				stack.push(sname + "!" + encode_range(r));
+				stack.push(sname + "!" + encode_range((r)));
 				break;
 			/* 2.5.198.41 */
 			case 'PtgAttrSum':
@@ -10168,6 +10216,7 @@ function xlml_normalize(d) {
 var xlmlregex = /<(\/?)([^\s?>!\/:]*:|)([^\s?>]*[^\s?>\/])[^>]*>/mg;
 //var xlmlregex = /<(\/?)([a-z0-9]*:|)(\w+)[^>]*>/mg;
 function parse_xlml_xml(d, opts) {
+	make_ssf(SSF);
 	var str = debom(xlml_normalize(d));
 	if(opts && opts.type == 'binary' && typeof cptable !== 'undefined') str = cptable.utils.decode(65001, char_codes(str));
 	if(str.substr(0,1000).indexOf("<html") >= 0) return parse_html(str, opts);
@@ -10277,7 +10326,10 @@ for(var cma = c; cma <= cc; ++cma) {
 			break;
 
 		case 'NumberFormat':
-			stag.nf = xlml_parsexmltag(Rn[0]).Format || "General";
+			stag.nf = unescapexml(xlml_parsexmltag(Rn[0]).Format || "General");
+			if(XLMLFormatMap[stag.nf]) stag.nf = XLMLFormatMap[stag.nf];
+			for(var ssfidx = 0; ssfidx != 0x188; ++ssfidx) if(SSF._table[ssfidx] == stag.nf) break;
+			if(ssfidx == 0x188) for(ssfidx = 0x39; ssfidx != 0x188; ++ssfidx) if(SSF._table[ssfidx] == null) { SSF.load(stag.nf, ssfidx); break; }
 			break;
 
 		case 'Column':
@@ -10953,7 +11005,7 @@ function parse_workbook(blob, options) {
 	var out = {};
 	var Directory = {};
 	var found_sheet = false;
-	var range = {};
+	var range = ({});
 	var last_formula = null;
 	var sst = [];
 	var cur_sheet = "";
@@ -13914,9 +13966,7 @@ function writeSync(wb, opts) {
 	}
 }
 
-function writeFileSync(wb, filename, opts) {
-	var o = opts||{}; o.type = 'file';
-	o.file = filename;
+function resolve_book_type(o/*?WriteFileOpts*/) {
 	if(!o.bookType) switch(o.file.slice(-5).toLowerCase()) {
 		case '.xlsx': o.bookType = 'xlsx'; break;
 		case '.xlsm': o.bookType = 'xlsm'; break;
@@ -13929,9 +13979,23 @@ function writeFileSync(wb, filename, opts) {
 		case '.ods': o.bookType = 'ods'; break;
 		case '.csv': o.bookType = 'csv'; break;
 	}}
+}
+
+function writeFileSync(wb, filename, opts) {
+	var o = opts||{}; o.type = 'file';
+	o.file = filename;
+	resolve_book_type(o);
 	return writeSync(wb, o);
 }
 
+function writeFileAsync(filename, wb, opts, cb) {
+	var o = opts||{}; o.type = 'file';
+	o.file = filename;
+	resolve_book_type(o);
+	o.type = 'buffer';
+	var _cb = cb; if(!(_cb instanceof Function)) _cb = (opts);
+	return _fs.writeFile(filename, writeSync(wb, o), _cb);
+}
 function decode_row(rowstr) { return parseInt(unfix_row(rowstr),10) - 1; }
 function encode_row(row) { return "" + (row + 1); }
 function fix_row(cstr) { return cstr.replace(/([A-Z]|^)(\d+)$/,"$1$$$2"); }
@@ -13999,8 +14063,8 @@ function format_cell(cell, v, o) {
 	if(cell == null || cell.t == null || cell.t == 'z') return "";
 	if(cell.w !== undefined) return cell.w;
 	if(cell.t == 'd' && !cell.z && o && o.dateNF) cell.z = o.dateNF;
-	if(v == undefined) return safe_format_cell(cell, cell.v);
-	return safe_format_cell(cell, v);
+	if(v == undefined) return safe_format_cell(cell, cell.v, o);
+	return safe_format_cell(cell, v, o);
 }
 
 function sheet_to_json(sheet, opts){
@@ -14032,7 +14096,7 @@ function sheet_to_json(sheet, opts){
 			case 3: hdr[C] = o.header[C - r.s.c]; break;
 			default:
 				if(val == null) continue;
-				vv = v = format_cell(val);
+				vv = v = format_cell(val, null, o);
 				var counter = 0;
 				for(var CC = 0; CC < hdr.length; ++CC) if(hdr[CC] == vv) vv = v + "_" + (++counter);
 				hdr[C] = vv;
@@ -14068,19 +14132,17 @@ function sheet_to_json(sheet, opts){
 					else if(raw && v === null) row[hdr[C]] = null;
 					else continue;
 				} else {
-					row[hdr[C]] = raw ? v : format_cell(val,v);
+					row[hdr[C]] = raw ? v : format_cell(val,v,o);
 				}
 				isempty = false;
 			}
 		}
-		if(isempty === false || header === 1) out[outi++] = row;
+		if((isempty === false) || (header === 1 ? o.blankrows !== false : !!o.blankrows)) out[outi++] = row;
 	}
 	out.length = outi;
 	return out;
 }
 
-function sheet_to_row_object_array(sheet, opts) { return sheet_to_json(sheet, opts != null ? opts : {}); }
-
 function sheet_to_csv(sheet, opts) {
 	var out = "", txt = "", qreg = /"/g;
 	var o = opts == null ? {} : opts;
@@ -14088,27 +14150,31 @@ function sheet_to_csv(sheet, opts) {
 	var r = safe_decode_range(sheet["!ref"]);
 	var FS = o.FS !== undefined ? o.FS : ",", fs = FS.charCodeAt(0);
 	var RS = o.RS !== undefined ? o.RS : "\n", rs = RS.charCodeAt(0);
-	var endregex = new RegExp(FS+"+$");
+	var endregex = new RegExp((FS=="|" ? "\\|" : FS)+"+$");
 	var row = "", rr = "", cols = [];
 	var i = 0, cc = 0, val;
 	var R = 0, C = 0;
 	for(C = r.s.c; C <= r.e.c; ++C) cols[C] = encode_col(C);
 	for(R = r.s.r; R <= r.e.r; ++R) {
+		var isempty = true;
 		row = "";
 		rr = encode_row(R);
 		for(C = r.s.c; C <= r.e.c; ++C) {
 			val = sheet[cols[C] + rr];
 			if(val == null) txt = "";
 			else if(val.v != null) {
-				txt = ''+format_cell(val);
+				isempty = false;
+				txt = ''+format_cell(val, null, o);
 				for(i = 0, cc = 0; i !== txt.length; ++i) if((cc = txt.charCodeAt(i)) === fs || cc === rs || cc === 34) {
 					txt = "\"" + txt.replace(qreg, '""') + "\""; break; }
 			} else if(val.f != null && !val.F) {
+				isempty = false;
 				txt = '=' + val.f; if(txt.indexOf(",") >= 0) txt = '"' + txt.replace(qreg, '""') + '"';
 			} else txt = "";
 			/* NOTE: Excel CSV does not support array formulae */
 			row += (C === r.s.c ? "" : FS) + txt;
 		}
+		if(o.blankrows === false && isempty) continue;
 		if(o.strip) row = row.replace(endregex,"");
 		out += row + RS;
 	}
@@ -14166,10 +14232,11 @@ var utils = {
 	make_csv: sheet_to_csv,
 	make_json: sheet_to_json,
 	make_formulae: sheet_to_formulae,
+	aoa_to_sheet: aoa_to_sheet,
 	sheet_to_csv: sheet_to_csv,
 	sheet_to_json: sheet_to_json,
 	sheet_to_formulae: sheet_to_formulae,
-	sheet_to_row_object_array: sheet_to_row_object_array
+	sheet_to_row_object_array: sheet_to_json
 };
 XLSX.parse_xlscfb = parse_xlscfb;
 XLSX.parse_ods = parse_ods;
@@ -14182,6 +14249,7 @@ XLSX.readFileSync = readFileSync;
 XLSX.write = writeSync;
 XLSX.writeFile = writeFileSync;
 XLSX.writeFileSync = writeFileSync;
+XLSX.writeFileAsync = writeFileAsync;
 XLSX.utils = utils;
 XLSX.CFB = CFB;
 XLSX.SSF = SSF;