Refactored -compass-space-list to accept a single array argument.

lib/compass/functions/_cross_browser_support.scss

@@ -21,7 +21,7 @@
   $properties: "";
 
   // Support for polymorphism.
-  @if length($property1) > 1 and $property2 == null {
+  @if type-of($property1) == 'list' {
     // Passing a single array of properties.
     $properties: $property1;
   } @else {

lib/compass/functions/_lists.scss

@@ -20,13 +20,23 @@
 // compass_list can't be implemented in sass script
 
 @function -compass-space-list($item1, $item2:null, $item3:null, $item4:null, $item5:null, $item6:null, $item7:null, $item8:null, $item9:null) {
-  $items: $item2, $item3, $item4, $item5, $item6, $item7, $item8, $item9;
-  $full: $item1;
-  @each $item in $items {
+  // Support for polymorphism.
+  @if type-of($item1) == 'list' {
+    // Passing a single array of properties.
+    $items: $item1;
+  } @else {
+    $items: $item1 $item2 $item3 $item4 $item5 $item6 $item7 $item8 $item9;
+  }
+
+  $full: first-value-of($items);
+
+  @for $i from 2 through length($items) {
+    $item: nth($items, $i);
     @if $item != null {
       $full: $full $item;
-    }    
+    }
   }
+
   @return $full;
 }