Index: core.js
===================================================================
--- core.js	(revision 6544)
+++ core.js	(working copy)
@@ -182,6 +182,8 @@
 
 		ret.context = this.context;
 
+		selector = selector.selector !== undefined ? selector.selector : selector;
+
 		if ( name === "find" ) {
 			ret.selector = this.selector + (this.selector ? " " : "") + selector;
 		} else if ( name ) {