gistfile1.txt

  extend: function() {
    var Class = makeCtor(), proto;
    Class.ClassMixin = Ember.Mixin.create(this.ClassMixin);
    Class.PrototypeMixin = Ember.Mixin.create(this.PrototypeMixin);

    Class.ClassMixin.ownerConstructor = Class;
    Class.PrototypeMixin.ownerConstructor = Class;

    var PrototypeMixin = Class.PrototypeMixin;
    PrototypeMixin.reopen.apply(PrototypeMixin, arguments);

    Class.superclass = this;
    Class.__super__  = this.prototype;

    proto = Class.prototype = o_create(this.prototype);
    proto.constructor = Class;
    Ember.generateGuid(proto, 'ember');
    meta(proto).proto = proto; // this will disable observers on prototype


    Class.subclasses = Ember.Set ? new Ember.Set() : null;
    if (this.subclasses) { this.subclasses.add(Class); }

    Class.ClassMixin.apply(Class);
    return Class;
  },

  create: function() {
    var C = this;
    if (arguments.length>0) { this._initMixins(arguments); }
    return new C();
  },