@jernst I suspect(?) you know a bit more of what is happening functionally, but you’re probably right that more of this could be better documented. I’ll circle around shortly to try to help improve it, but in the erstwhile I’ve written some separate documentation on my own site about it along with some examples: http://boffosocko.com/2017/08/11/post-kinds-plugin-for-wordpress/
I’ve also got a video walk through on my to do list as well.

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