ReactiveCocoa/ReactiveCocoa — pull request #1549 by alanjrogers (2014-10-29 11:04:30+00:00)
Title: Fix .replay(1) when only one value has been sent on the HotSignal

It took me a while to track this down, but it looks like `.replay(1)` on a hot signal would result in an empty `ColdSignal` if only the hot signal had only ever sent one value.

/cc @jspahrsummers