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ok I think I've really got this working. - rich text CRDT (peritext-based) - movable blocks with split & join, retaining provenance and collaborative editing - strong cycle prevention both for split/join and block nesting annnd just for fun I've also implemented multicursor in the demo (cmd+click)

Awesome stuff! On mobile the block handling feels a little awkward with backspace often going to the previous block? Also autocomplete seems to break it easily (specifically triggering the autocomplete works, but auto-auto-complete with space doesn't)