[options] Reapply hotfix for #389

Author: haoqunjiang

src/options/unitless-zero.js

@@ -23,13 +23,13 @@ module.exports = {
 
         if (value.is('dimension')) {
           var unit = value.first('ident').content;
-          if (value.first('number').content[0] === '0' &&
+          if (value.first('number').content === '0' &&
               UNITS.indexOf(unit) !== -1) {
             value.removeChild(1);
           }
         } else if (value.is('percentage')) {
           var number = value.first('number').content;
-          if (number[0] === '0') {
+          if (number === '0') {
             value.type = 'number';
             value.content = number;
           }
@@ -56,7 +56,7 @@ module.exports = {
       }
 
       if (node.is('dimension') &&
-          node.first('number').content[0] === '0' &&
+          node.first('number').content === '0' &&
           node.first('ident').content !== 'deg') {
         detected.push(false);
         return;
@@ -65,7 +65,7 @@ module.exports = {
       // If we see a zero and previous node is not percentage
       // or dimension, then we have an option
       if (node.is('number') &&
-          node.content[0] === '0' &&
+          node.content === '0' &&
           !parent.is('percentage') &&
           !parent.is('dimension')) {
         detected.push(true);