ReactiveCocoa/ReactiveCocoa — pull request #309 by jspahrsummers (2013-02-06 06:07:09+00:00)
Title: RACSequence contract

Part of #304.

[Rendered Markdown](https://github.com/ReactiveCocoa/ReactiveCocoa/blob/sequence-contract/Documentation/DesignGuidelines.md#the-racsequence-contract)