rem: return this.map(function(pair) { return pair.map(encodeURIComponent).join('='); }).join('&'); 
add: return this.select(function(value) { return value != undefined || value != null; }); 
context:     return this.map(function(pair) {      return pair.map(encodeURIComponent).join('=');    }).join('&');
meta: 6601	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/6601/28b3187d07d97712c23182569a4d6fd00900b5f7/prototype.js/buggy/javascript/prototype/prototype.js