I've recently implemented a rich text editor on top of Automerge and Peritext that supports blocks, inline-blocks (or whatever you call them: images, tables, et

I've recently implemented a rich text editor on top of Automerge and Peritext that supports blocks, inline-blocks (or whatever you call them: images, tables, etc.), unaware that this was in the works. The implementation ended up _very_ close to what's described in the linked post.