ReactiveCocoa/ReactiveCocoa — pull request #307 by jspahrsummers (2013-02-05 06:39:32+00:00)
Title: "Implementing new operator" guidelines

**:warning: NOT READY TO MERGE :warning:**

[Rendered Markdown](https://github.com/ReactiveCocoa/ReactiveCocoa/blob/new-operator-guidelines/Documentation/DesignGuidelines.md#implementing-new-operators)

To-do:

- [ ] Prefer building on RACStream methods
- [ ] Compose existing operators when possible
- [ ] Avoid introducing concurrency
- [ ] Cancel work and clean up all resources in a disposable
- [ ] Do not block in an operator
- [ ] Avoid stack overflow from deep recursion