rem: newHash.d == undefined, 
add: Assert.isTrue(newHash.d === undefined), 
context: 	filter: function(){		var oldHash = new Hash({a:1, b:2, c:3, d: 'no'});		var newHash = oldHash.filter(function(item){			return ($type(item) == 'number');		});		this.end(			newHash.d == undefined,			Assert.equals(newHash.a, 1)		);	},
meta: 9980	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9980/f98ec1ab149f173a9660792986c96b4be0d6e14e/Hash.js/clean/Test/Native/Hash.js