rem: if (this.indexOf(item) != -1) this.push(item); 
add: if (!this.test(item)) this.push(item); 
context: 	include: function(item){		if (this.indexOf(item) != -1) this.push(item);		return this;	}
meta: 8516	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8516/137ad952133182c7285b0a30e94d24365615e46f/Array.js/clean/Native/Array.js