emberjs/data — pull request #2320 by stefanpenner (2014-09-27 06:37:43+00:00)
Title: a bit verbose, but lets ensure we don’t deoptimize these functions in so...

...me runtimes.

* passing arguments object to another function (other then via apply) deoptimizes function body
* materializing the arguments object via splice deoptimizes the function body