emberjs/ember.js — pull request #4079 by alexspeller (2014-01-05 20:56:17+00:00)
Title: Em.computed.empty and Em.computed.notEmpty are broken for array mutation

JSFiddle example: http://jsfiddle.net/alexspeller/jUjU4/5/

Failing test for failing computed property macros - they do not work on mutation of the array.