Index: _source/includes/scriptcompressor.js
===================================================================
--- _source/includes/scriptcompressor.js	(revision 3491)
+++ _source/includes/scriptcompressor.js	(working copy)
@@ -881,7 +881,7 @@
 				{
 					var id = String( ids[ counter++ ] );
 
-					if ( isReserved( id ) || !/^(?:(?:[a-zA-Z$_][\w$_]*)|(?:\d+))$/.test( id ) )
+					if ( isReserved( id ) || !/^(?:(?:[a-zA-Z$_][\w$_]*)|(?:0|[1-9]\d*))$/.test( id ) )
 						outString( id );
 					else
 						out( id );