rem: return this.select(function(value) { return !values.include(value); }); 
add: return this.collect(function(value, index) { return {value: value, criteria: iterator(value, index)}; }).sort(function(left, right) { 
context:     return this.select(function(value) {      return !values.include(value);    });
meta: 3974	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3974/af9adbf17404d887f31369756326b0109da7ae2b/prototype.js/buggy/root/static/js/prototype.js