ReactiveCocoa/ReactiveCocoa — pull request #1184 by kastiglione (2014-03-18 14:35:23+00:00)
Title: Retain object over -setValue:forKeyPath:

Fixes #1182

Since the bridge cast does not retain the object, we're effectively messaging an `unsafe_unretained`, which can be deallocated during the course of `-setValue:forKeyPath:`. Using precise lifetime here gets us the retain on object.