Ticket #2773: is.diff

core.js

@@ -349 +349 @@
         },
 
         is: function( selector ) {
-                return !!selector && jQuery.multiFilter( selector, this ).length > 0;
+                return typeof selector == 'string' ? 
+                        jQuery.multiFilter( selector, this ).length > 0 :
+                        jQuery.inArray( selector, this ) != -1;
         },
 
         hasClass: function( selector ) {