github/ReactiveCocoa — pull request #207 by joshaber (2012-12-21 20:50:36+00:00)
Title: Fix lift cycle

`NSInvocation`, in its infinite wisdom, retains its target and doesn't even release it if `target` is later set to `nil`. So all lifts would create a retain cycle.

This fixes that by re-creating the `NSInvocation` for each call.