rem: keys[i] = NullKey; 
add: this.keys[i] = NullKey; 
context:     this.remove = function (key){      for (var i=0;i<keys.length;i++){        var entry = keys[i];        if (entry instanceof NullKey) continue;        if (entry.key == key){            keys[i] = NullKey;        }      }            };
meta: 8932	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8932/f526bb9863fd46c554c216bca02d40198da13e02/log4js.js/buggy/trunk/src/js/log4js.js