There's a couple. They're not even really rules, more just telling you what you can expect.
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Issues are ALWAYS welcome, whether or not you think it's a dumb question or it's been asked before. I make a very real attempt to respond to all issues in 24 hours. You can email me directly if I don't make this deadline.
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Pull requests for small bug fixes have the same rules as issues, just submit it and I'll get to it ASAP.
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I'm very hesitant to change the actual API in any way normally. But I also don't like telling people to throw away work they've already done. So please, before you go adding a new feature and submitting a PR, please submit an issue so we can possibly save you some work.
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The API never breaks. All PRs which aren't backwards compatible will not be accepted. Similarly, if I do commit something which isn't backwards compatible with an older behavior please submit an issue ASAP so I can fix it.