Automattic/media-explorer — pull request #47 by bendoh (2013-12-02 18:12:52+00:00)
Title: Don't extend from aliases: it breaks the inheritence chain.

If another plugin extends wp.media.view.MediaFrame.Post (such as my new getty-images plugin,) extending by using an alias causes the plugin to break. I really don't know why, but this fixes it and does not break your code.