github/ReactiveCocoa — pull request #278 by jspahrsummers (2013-01-09 00:09:03+00:00)
Title: Optimize disposables

_Depends on #274 and #277._

Disposables are pretty heavily used in RAC, so I've optimized the hell out of them. Used Instruments along the way, and the speedup isn't mind-blowing, but it's significant.