Honestly, just my personal confidence currently. There's very basic locking and store-wide read-write. I really aspire to some sort of CRDT implementation that can be considered a bit more state-of-the-art and tolerant to the innumerable challenges of that problem.
I think that CRDT and OTs are a bit overkill for TinyBase. Most apps are not text editors or figma. Most apps are just forms. The general solution for forms is to track which fields on a record have been modified by the user. The user’s change is the source truth and never gets overwritten by the network. Other fields are free to be updated collaboratively from the network. Once the user has synced that field it is free to be updated by the network.
This kind of solution can be built on top of TinyBase without CRDTs.