rem: var proto = $merge(this.prototype); 
add: var proto = new this(null); 
context: 	extend: function(properties){		var proto = $merge(this.prototype);		for (var property in properties){			var pp = proto[property];			proto[property] = $mergeClass(pp, properties[property]);		}		return new Class(proto);	},
meta: 6317	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/6317/93dc1ffd42e658790f9bc8df252a86b4ab1eede6/Moo.js/clean/Core/Moo.js