var arr = this.local.array.concat([false, null, 4]).filter(this.local.comparator); 
var arr = this.local.array.concat([false, null, 4]).filter(Number.type); 
	'should return a `filter`ed array': function(){		var arr = this.local.array.concat([false, null, 4]).filter(this.local.comparator);		value_of(arr).should_be(this.local.array.concat(4));	},
5733	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5733/d56b8c673b94ffe29dd9513293283e0366ae55d0/Array.js/clean/Spec/Native/Array.js