ReactiveCocoa/ReactiveCocoa — pull request #1070 by jspahrsummers (2014-01-21 20:50:03+00:00)
Title: Remove RACCommand.observationInfo override

Although storing this information on the object directly is supposed to improve performance, it seems to introduce `EXC_BAD_ACCESS` crashes during some KVO calls.

Whether it’s the direct cause or just exposes some underlying issue is unclear, but we can at least reduce the incidence by going through the global KVO machinery.