emberjs/ember.js — pull request #5480 by rwjblue (2014-08-24 20:55:49+00:00)
Title: Prevent extra method.toString checks.

It appears that the intent here was to only check the `method.toString().indexOf('_super')` once, and store the result so that we do not need to check the same method twice, but we were never actual storing `__hasSuper` on the method so it was just always going to check the `toString`.

@stefanpenner - Can you confirm this was your original intent?