diff --git a/Makefile b/Makefile
index 85cf42d..308cf28 100755
--- a/Makefile
+++ b/Makefile
@@ -34,6 +34,10 @@ bits/01_version.js: package.json
 clean: ## Remove targets and build artifacts
 	rm -f $(TARGET) $(FLOWTARGET)
 
+.PHONY: git
+git: ## show version string
+	@echo "$$(node -pe 'require("./package.json").version') (ssf)"
+
 
 ## Testing
 
@@ -43,7 +47,7 @@ test mocha: ## Run test suite
 
 .PHONY: test_misc
 test_misc:
-	MINTEST=1 npm test
+	MINTEST=1 mocha -R spec -t 30000
 
 .PHONY: travis
 travis: ## Run test suite with minimal output
@@ -51,7 +55,7 @@ travis: ## Run test suite with minimal output
 
 .PHONY: ctest
 ctest: ## Build browser test fixtures
-	browserify -t brfs test/{dateNF,dates,exp,fraction,general,implied,oddities,utilities,comma,valid}.js > ctest/test.js
+	browserify -t brfs test/{comma,dateNF,dates,exp,fraction,general,implied,oddities,utilities,valid}.js > ctest/test.js
 
 .PHONY: ctestserv
 ctestserv: ## Start a test server on port 8000
diff --git a/bits/01_version.js b/bits/01_version.js
index 58084d3..dd68d9f 100644
--- a/bits/01_version.js
+++ b/bits/01_version.js
@@ -1 +1 @@
-SSF.version = '0.10.3';
+SSF.version = '0.11.0';
diff --git a/package.json b/package.json
index d6ad637..a984dcd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "ssf",
-	"version": "0.10.3",
+	"version": "0.11.0",
 	"author": "sheetjs",
 	"description": "Format data using ECMA-376 spreadsheet Format Codes",
 	"keywords": [
diff --git a/ssf.flow.js b/ssf.flow.js
index e10cc1d..6adb6d0 100644
--- a/ssf.flow.js
+++ b/ssf.flow.js
@@ -4,7 +4,7 @@
 /*:: declare var DO_NOT_EXPORT_SSF: any; */
 var SSF/*:SSFModule*/ = ({}/*:any*/);
 var make_ssf = function make_ssf(SSF/*:SSFModule*/){
-SSF.version = '0.10.3';
+SSF.version = '0.11.0';
 function _strrev(x/*:string*/)/*:string*/ { var o = "", i = x.length-1; while(i>=0) o += x.charAt(i--); return o; }
 function fill(c/*:string*/,l/*:number*/)/*:string*/ { var o = ""; while(o.length < l) o+=c; return o; }
 function pad0(v/*:any*/,d/*:number*/)/*:string*/{var t=""+v; return t.length>=d?t:fill('0',d-t.length)+t;}
@@ -652,7 +652,7 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 				}
 				/* falls through */
 			case '0': case '#':
-				o = c; while((++i < fmt.length && "0#?.,E+-%".indexOf(c=fmt.charAt(i)) > -1) || (c=='\\' && fmt.charAt(i+1) == "-" && i < fmt.length - 2 && "0#".indexOf(fmt.charAt(i+2))>-1)) o += c;
+				o = c; while(++i < fmt.length && "0#?.,E+-%".indexOf(c=fmt.charAt(i)) > -1) o += c;
 				out[out.length] = {t:'n', v:o}; break;
 			case '?':
 				o = c; while(fmt.charAt(++i) === c) o+=c;
@@ -711,7 +711,7 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 				/*::if(!dt) throw "unreachable"; */
 				out[i].v = write_date(out[i].t.charCodeAt(0), out[i].v, dt, ss0);
 				out[i].t = 't'; break;
-			case 'n': case '(': case '?':
+			case 'n': case '?':
 				jj = i+1;
 				while(out[jj] != null && (
 					(c=out[jj].t) === "?" || c === "D" ||
@@ -731,7 +731,7 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 	if(nstr.length > 0) {
 		if(nstr.charCodeAt(0) == 40) /* '(' */ {
 			myv = (v<0&&nstr.charCodeAt(0) === 45 ? -v : v);
-			ostr = write_num('(', nstr, myv);
+			ostr = write_num('n', nstr, myv);
 		} else {
 			myv = (v<0 && flen > 1 ? -v : v);
 			ostr = write_num('n', nstr, myv);
@@ -746,7 +746,7 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 		var lasti=out.length;
 		if(decpt === out.length && ostr.indexOf("E") === -1) {
 			for(i=out.length-1; i>= 0;--i) {
-				if(out[i] == null || 'n?('.indexOf(out[i].t) === -1) continue;
+				if(out[i] == null || 'n?'.indexOf(out[i].t) === -1) continue;
 				if(jj>=out[i].v.length-1) { jj -= out[i].v.length; out[i].v = ostr.substr(jj+1, out[i].v.length); }
 				else if(jj < 0) out[i].v = "";
 				else { out[i].v = ostr.substr(0, jj+1); jj = -1; }
@@ -758,7 +758,7 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 		else if(decpt !== out.length && ostr.indexOf("E") === -1) {
 			jj = ostr.indexOf(".")-1;
 			for(i=decpt; i>= 0; --i) {
-				if(out[i] == null || 'n?('.indexOf(out[i].t) === -1) continue;
+				if(out[i] == null || 'n?'.indexOf(out[i].t) === -1) continue;
 				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) {
@@ -783,7 +783,7 @@ function eval_fmt(fmt/*:string*/, v/*:any*/, opts/*:any*/, flen/*:number*/) {
 			}
 		}
 	}
-	for(i=0; i<out.length; ++i) if(out[i] != null && 'n(?'.indexOf(out[i].t)>-1) {
+	for(i=0; i<out.length; ++i) if(out[i] != null && 'n?'.indexOf(out[i].t)>-1) {
 		myv = (flen >1 && v < 0 && i>0 && out[i-1].v === "-" ? -v:v);
 		out[i].v = write_num(out[i].t, out[i].v, myv);
 		out[i].t = 't';
diff --git a/ssf.js b/ssf.js
index 30fc0f7..0e4c1c4 100644
--- a/ssf.js
+++ b/ssf.js
@@ -3,7 +3,7 @@
 /*jshint -W041 */
 var SSF = ({});
 var make_ssf = function make_ssf(SSF){
-SSF.version = '0.10.3';
+SSF.version = '0.11.0';
 function _strrev(x) { var o = "", i = x.length-1; while(i>=0) o += x.charAt(i--); return o; }
 function fill(c,l) { var o = ""; while(o.length < l) o+=c; return o; }
 function pad0(v,d){var t=""+v; return t.length>=d?t:fill('0',d-t.length)+t;}
@@ -645,7 +645,7 @@ function eval_fmt(fmt, v, opts, flen) {
 				}
 				/* falls through */
 			case '0': case '#':
-				o = c; while((++i < fmt.length && "0#?.,E+-%".indexOf(c=fmt.charAt(i)) > -1) || (c=='\\' && fmt.charAt(i+1) == "-" && i < fmt.length - 2 && "0#".indexOf(fmt.charAt(i+2))>-1)) o += c;
+				o = c; while(++i < fmt.length && "0#?.,E+-%".indexOf(c=fmt.charAt(i)) > -1) o += c;
 				out[out.length] = {t:'n', v:o}; break;
 			case '?':
 				o = c; while(fmt.charAt(++i) === c) o+=c;
@@ -701,7 +701,7 @@ if(dt.u >= 0.5) { dt.u = 0; ++dt.S; }
 			case 'd': case 'm': case 'y': case 'h': case 'H': case 'M': case 's': case 'e': case 'b': case 'Z':
 out[i].v = write_date(out[i].t.charCodeAt(0), out[i].v, dt, ss0);
 				out[i].t = 't'; break;
-			case 'n': case '(': case '?':
+			case 'n': case '?':
 				jj = i+1;
 				while(out[jj] != null && (
 					(c=out[jj].t) === "?" || c === "D" ||
@@ -721,7 +721,7 @@ out[i].v = write_date(out[i].t.charCodeAt(0), out[i].v, dt, ss0);
 	if(nstr.length > 0) {
 		if(nstr.charCodeAt(0) == 40) /* '(' */ {
 			myv = (v<0&&nstr.charCodeAt(0) === 45 ? -v : v);
-			ostr = write_num('(', nstr, myv);
+			ostr = write_num('n', nstr, myv);
 		} else {
 			myv = (v<0 && flen > 1 ? -v : v);
 			ostr = write_num('n', nstr, myv);
@@ -736,7 +736,7 @@ out[i].v = write_date(out[i].t.charCodeAt(0), out[i].v, dt, ss0);
 		var lasti=out.length;
 		if(decpt === out.length && ostr.indexOf("E") === -1) {
 			for(i=out.length-1; i>= 0;--i) {
-				if(out[i] == null || 'n?('.indexOf(out[i].t) === -1) continue;
+				if(out[i] == null || 'n?'.indexOf(out[i].t) === -1) continue;
 				if(jj>=out[i].v.length-1) { jj -= out[i].v.length; out[i].v = ostr.substr(jj+1, out[i].v.length); }
 				else if(jj < 0) out[i].v = "";
 				else { out[i].v = ostr.substr(0, jj+1); jj = -1; }
@@ -748,7 +748,7 @@ out[i].v = write_date(out[i].t.charCodeAt(0), out[i].v, dt, ss0);
 		else if(decpt !== out.length && ostr.indexOf("E") === -1) {
 			jj = ostr.indexOf(".")-1;
 			for(i=decpt; i>= 0; --i) {
-				if(out[i] == null || 'n?('.indexOf(out[i].t) === -1) continue;
+				if(out[i] == null || 'n?'.indexOf(out[i].t) === -1) continue;
 				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) {
@@ -773,7 +773,7 @@ out[i].v = write_date(out[i].t.charCodeAt(0), out[i].v, dt, ss0);
 			}
 		}
 	}
-	for(i=0; i<out.length; ++i) if(out[i] != null && 'n(?'.indexOf(out[i].t)>-1) {
+	for(i=0; i<out.length; ++i) if(out[i] != null && 'n?'.indexOf(out[i].t)>-1) {
 		myv = (flen >1 && v < 0 && i>0 && out[i-1].v === "-" ? -v:v);
 		out[i].v = write_num(out[i].t, out[i].v, myv);
 		out[i].t = 't';