First off, thanks for publishing this code. It's really helpful for working with YJS in Go.
This isn't an issue as much as a discussion, but discussions aren't enabled in this repo.

What is the difference between combineYUpdates in db.go and Y.mergeUpdates from the original JS API and merge_updates from the rust API?

IIUC you had to write out a combineYUpdates function simply because the TFFI CFFI doesn't expose a mergeUpdates function?

I'm not familiar with YJS, so I was wondering if there was something else I was missing.