add: if (!pair.value && pair.value !== 0) pair[1] = ''; if (!pair.key) return; 
context:   toQueryString: function() {    return this.map(function(pair) {      return pair.map(encodeURIComponent).join('=');    }).join('&');  },
meta: 2801	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2801/7e143d2df37946a5416f0f043869478087652eb6/prototype.js/clean/examples/testcases/prototype.js