Inheritance, Pseudo Classes and Mixins Gone Awray | railway

The interesting point missed in this article is that mixins actually do create a superclass relationship in Ruby:

http://gist.github.com/945435

There's an anonymous superclass injected into the inheritance chain every time a module is included into a class.

So, while it might make sense to use explicit superclasses as a semantic modeling method, the runtime behavior is effectively the same whether you use a mixin or a concrete class.