emberjs/ember.js — pull request #9889 by slindberg (2014-12-12 00:53:41+00:00)
Title: Changed injected properties to behave like Ember.computed.reads

See #9884

Removes assertion when attempting to set an injected property. Implemented by reusing alias properties' `set` method. I didn't understand the implementation of it fully, but I assume it was done that way for a good reason.