emberjs/ember.js — pull request #9474 by rwjblue (2014-11-02 23:56:16+00:00)
Title: Allow all rejection types.

In `RSVP.onerrorDefault` we only handled `instanceof Error`, but we really only care about ignoring `TransitionAborted` (because that is the only acceptable rejection).

This ensures that `String` errors are still handled by `RSVP.onerrorDefault`.