While writing 3.0, the developers attempted to capture some reasoning and decision information in internal documentation meant for future developers and maintaners. Most of this information is unnecessary for users and plugin developers. Some of it, however, is linked to from the plugin development documentation.
Keep in mind that not everything will be here and you may need to help pull information out of the developers' heads and into these documents. Please pull gently.
contributing writing-documentation writing-code releases start-to-finish checker cli formatters option_handling plugin_handling utils