Improved prefixed() function.

lib/compass/functions/_cross_browser_support.scss

@@ -4,8 +4,17 @@
 // 
 
 @function prefixed($prefix, $property1, $property2:null, $property3:null, $property4:null, $property5:null, $property6:null, $property7:null, $property8:null, $property9:null) {
-  // This is a hack that assumes everything should be prefixed.
-  @return true;
+  $properties: $property1, $property2, $property3, $property4, $property5, $property6, $property7, $property8, $property9;
+  $prefixed: false;
+  @each $item in $properties {
+    @if type-of($item) == 'string' {
+      $prefixed: $prefixed or str-index($item, 'url') != 1 and str-index($item, 'rgb') != 1 and str-index($item, '#') != 1;
+    } @elseif type-of($item) == 'color' {
+    } @elseif $item != null {
+      $prefixed: true;
+    }
+  }
+  @return $prefixed;
 }
 
 @function prefix($prefix, $property1, $property2:null, $property3:null, $property4:null, $property5:null, $property6:null, $property7:null, $property8:null, $property9:null) {

test/functionsSpec.js

@@ -99,4 +99,11 @@ describe("Cross Browser Functions", function () {
     });
   });
 
+  it("should not prefix numbers or colors", function(done){
+    render(property('prefixed(-ok, rgb(0,0,0))')+property('prefixed(-ok, url(1.gif))')+property('prefixed(-ok, ok)'), function(output, err) {
+      expect(output).toBe(property('false')+property('false')+property('true'));
+      done();
+    });
+  });
+
 });