rem: if (this.has(key) && this[key] === value) return key; 
add: if (this.hasOwnProperty(key) && this[key] === value) return key; 
context: 	keyOf: function(value){		for (var key in this){			if (this.has(key) && this[key] === value) return key;		}		return null;	},
meta: 7826	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/7826/7f57639a9463cd4e2577f39af7503ce7d0e73459/Hash.js/buggy/Source/Native/Hash.js