emberjs/ember.js — pull request #9425 by rwjblue (2014-10-29 04:08:12+00:00)
Title: [BUGFIX release] attributeBinding on class triggers assertion.

Using `attributeBinding: ['class']` will render your view unable to handle DOM events (`EventDispatcher` uses `.ember-view` class for events), `classNameBindings` is the more appropriate place to do this.

Closes #9424.