wiki.trwnh.com/content/tech/spec/activitypub/_index.md

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shortcomings

things that suck about the spec. could be improved by a new spec.

confusion

things that need clarification. could be improved by a rewrite.

gotchas

mistakes that implementations have made. could be improved by more guidance.

ideas

things that could reasonably be implemented

extensions

things not defined in activitypub proper