 			_asyncSort.abort();
 			
 			_uniqueStrings.length = 0;
-			_uniqueStringLookup = {};
+			_uniqueStringLookup.clear();
 			_stringToNumberFunction = null;
 			_numberToStringFunction = null;
 			

		/**
		 * String -> index in sorted _uniqueStrings
		 */
		private var _uniqueStringLookup:Object;

		public function setRecords(keys:Array, stringData:Array):void
		{

				return false;
			
			// keep track of unique strings
			if (!_uniqueStringLookup.has(value))
			{
				_uniqueStrings.push(value);
				// initialize mapping
				_uniqueStringLookup.set(value, -1);
			}
			
			return true;
