emberjs/ember.js — pull request #4850 by machty (2014-05-10 21:17:49+00:00)
Title: [FEATURE query-params-new] Don't overuse QP replace config

We don't want to look at query param replaceState config unless the only
thing that's changing in a transition is query params.

This is entirely @raytiley's code/effort. Give him credit.