value_of(arr).should_have(4, 'items'); 
	filter: function(){		var arr = [1, 2, 3, false, null, 0];		arr = arr.filter(function(item){			return ($type(item) == 'number');		});		value_of(arr).should_be([1,2,3,0]);	},
9494	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9494/1df74374a0f0b6727279f66d73d68b2ad06800b1/Array.js/buggy/Spec/Native/Array.js