rem: this.each(function(value, key){ delete this[key]; }, this); 
add: Hash.each(this, function(value, key){ keys.push(key); }); 
context: 		this.each(function(value, key){			delete this[key];		}, this);
meta: 6317	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/6317/7d911a6123ecbc59c2a46974db6ed449d9ad0986/Hash.js/buggy/Source/Native/Hash.js