How is y-leveldb coming along?

@dmonad First I want to say that yjs is amazing. I am building notebook app and yjs makes me implement offline and collaborative capability with little effort. I’m looking forward for y-leveldb being able to delivery diff without building a Y.Doc instance with the whole document. Is there an eta for this feature? As soon as I learn more about yjs internals, I will happily contribute with some code.