rem: rv += p + ", "; 
add: rv += rv ? ", " + p : p; 
context: function keys (o){    var rv = "";        for (var p in o)        rv += p + ", ";    return rv;    }
meta: 3298	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3298/4bede6c066a1bf316ce32c1a175e8068df6aaca8/utils.js/clean/js/lib/utils.js