emberjs/ember.js — pull request #1825 by kselden (2013-01-20 18:18:46+00:00)
Title: Make Ember.ContainerView implement Ember.MutableArray

BREAKING CHANGE
containerView.get('childViews').pushObject(childView)
becomes
containerView.pushObject(childView)

Ember.ContainerView's childViews is not a mutable
array and only reflects non virtual views like
Ember.View's childViews