(Please note that this is only a draft. Please feel free to make changes to this document. This is not a finalised guideline in any way.)
(Oh, and please summarise this guideline into a compact version. This is here so there's a fully-fledged guideline, but people will need a summary as well)
A Request for Comments Pull Request is used to gather votes from developers democratically to allow the majority to rule in making important decisions to the project. This allows implementation of controversial changes and features to be conducted in an orderly fashion.
A Request for Comments is critical to the autonomous governing of open source projects such as PocketMine, because it allows major decisions to be made by the community of developers, and not developers who just happen to be maintainers and have write access.