Fix for CPArray and _CPJavaScriptArray -copy

Foundation/CPArray/_CPJavaScriptArray.j

@@ -58,7 +58,7 @@
 
     for (; index < count; ++index)
     {
-        var object = [anArray objectatIndex:index];
+        var object = [anArray objectAtIndex:index];
 
         self[index] = object.isa ? [object copy] : object;
     }
@@ -212,6 +212,11 @@
     self[anIndex] = anObject;
 }
 
+- (void)copy
+{
+    return self.slice(0);
+}
+
 - (Class)classForCoder
 {
     return CPArray;