github/ReactiveCocoa — pull request #45 by jspahrsummers (2012-08-29 00:39:07+00:00)
Title: Don't clear the last values in +combineLatest:reduce:

This partially reverts commit a268f3100aefab1cf7efd889b6d6acc1ca9f821f.

This allows for incremental combination – i.e., after all subscribables have sent their initial next, any further nexts will result in a new callback, which I think is the Right Thing to do given the purpose of the method.

CC @bvanderveen