emberjs/ember.js — pull request #2394 by dagda1 (2013-04-04 07:48:36+00:00)
Title: assertion to catch mixins being passed to Object.create

I've added an assertion to stop stupid developers (like myself) trying to mix in definitions via Object create, e.g:
```
var o = Ember.Object.create(App.MyMixin);
```
The assertion will instruct the user to use createWithMixin instead.