gistfile1.js

var implement = function(key, value, retain){
	
	if (Class.Mutators.hasOwnProperty(key)){
		var mutator = Class.Mutators[key];
		value = mutator.call(this, value);
		if (value == null) return this;
	}
	
	if (typeOf(value) == 'function'){
		if (value.$hidden) return this;
		this.prototype[key] = (retain) ? value : wrap(this, key, value);	
	} else {
		Object.merge(this.prototype, key, value);
	}
	
	return this;
	
};

...

var extraProperties = ['hasOwnProperty', 'toSource', 'watch', 'unwatch', 'valueOf', 'isPrototypeOf',
	'propertyIsEnumerable', 'toLocaleString', 'toString', 'constructor'];
for(var i in {toString: 1}){ extraProperties = []; break; };

Class.implement({implement: function(object){
	for (var key in object) implement.call(this, key, object[key]);
	for (var i = extraProperties.length, name; i--;){
		name = extraProperties[i];
		if(object.hasOwnProperty(name)) implement.call(this, name, object[name]);
	}
	return this;
}});