ReactiveCocoa/ReactiveCocoa — pull request #748 by ikesyo (2013-08-14 05:51:00+00:00)
Title: Fix -rac_signalForSelector: doesn't invoke original method on previously KVO'd receiver

For previously KVO'd receiver, method alias for the existing method implementation is added to the KVO'd subclass.

But, because a forwarded invocation's target behaves as an instance of original class, the target doesn't respond to the alias selector.