Do not try to cast as number when decimals option is not defined

Author: glepretre

build/MathBox-bundle.js

@@ -46876,7 +46876,7 @@ MathBox.Renderable.Labels.prototype = _.extend(new MathBox.Renderable(null), {
         if (text === undefined) text = '';
 
         // Try to cast to number and round to n decimals
-        if (+text == text) {
+        if (decimals !== undefined && +text == text) {
           var x = +text;
           if (x != 0) {
             var s = x < 0 ? -1 : 1;

build/MathBox-bundle.min.js

@@ -4186,7 +4186,7 @@ MathBox.Renderable.Labels.prototype = _.extend(new MathBox.Renderable(null), {
         if (text === undefined) text = '';
 
         // Try to cast to number and round to n decimals
-        if (+text == text) {
+        if (decimals !== undefined && +text == text) {
           var x = +text;
           if (x != 0) {
             var s = x < 0 ? -1 : 1;

build/MathBox-core.js

@@ -7248,7 +7248,7 @@ MathBox.Renderable.Labels.prototype = _.extend(new MathBox.Renderable(null), {
         if (text === undefined) text = '';
 
         // Try to cast to number and round to n decimals
-        if (+text == text) {
+        if (decimals !== undefined && +text == text) {
           var x = +text;
           if (x != 0) {
             var s = x < 0 ? -1 : 1;