Jesus Christ, the first time I implemented #matrix room creation in #thurim years ago, I was targeting, like, room version v5? Or something? Probably still wasn't doing it right.
v12 of the spec requires so much ceremony! I've spent at least 5 hours on room creation and only just now finished the plumbing for the first event in the creation chain. At least now that all that is done, the rest of the chain should be easy to write.