Fix #394: unitless-zero vs fractions

Don't remove units from values starting from zero, like `0.5em`

Author: tonyganch

lib/options/unitless-zero.js

@@ -20,7 +20,7 @@ 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.remove(1);
                 }
@@ -40,7 +40,7 @@ module.exports = {
                     number = value.first('number').content;
                 }
 
-                if (number[0] === '0') {
+                if (number === '0') {
                     value.type = 'number';
                     value.content = number;
                 }
@@ -61,14 +61,14 @@ module.exports = {
         if (node.is('percentage') && node.first('number').content[1] === '0') {
             result = false;
         } else if (node.is('dimension') &&
-                   node.first('number').content[0] === '0' &&
+                   node.first('number').content === '0' &&
                    node.first('ident').content !== 'deg') {
             result = false;
         }
 
         // 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' &&
             this._prev !== 'percentage' &&
             this._prev !== 'dimension') {
             result = true;

test/options/unitless-zero/issue-394.css

@@ -0,0 +1,6 @@
+.example {
+  bottom: 0em;
+  left:   0.5em;
+  right:  1em;
+  top:    1.5em;
+}

test/options/unitless-zero/issue-394.expected.css

@@ -0,0 +1,6 @@
+.example {
+  bottom: 0;
+  left:   0.5em;
+  right:  1em;
+  top:    1.5em;
+}

test/options/unitless-zero/test.js

@@ -35,6 +35,11 @@ describe('options/unitless-zero', function() {
         );
     });
 
+    it('Issue 394', function() {
+        this.comb.configure({ 'unitless-zero': true });
+        this.shouldBeEqual('issue-394.css', 'issue-394.expected.css');
+    });
+
     it('Should detect unitless zero option', function() {
         this.shouldDetect(
             ['unitless-zero'],