add: value_of(arr).should_have(4, 'items'); 
context: 	filter_using_generics: function(){		var arr = (function(){			return arguments;		})(1, 2, 3, false, null, 0);		arr = Array.filter(arr, function(item){			return ($type(item) == 'number');		});		value_of(arr).should_be([1,2,3,0]);	},
meta: 5237	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5237/1df74374a0f0b6727279f66d73d68b2ad06800b1/Array.js/buggy/Spec/Native/Array.js