[jitl]

I'm quite surprised by the [benchmarks versus Automerge JS & Rust](https://github.com/jackyzha0/bft-json-crdt#benchmarks) when it comes to memory:

> Ours (Basic) 27.6MB

> Ours (BFT) 59.5MB

> Automerge (Rust) 232.5MB

I would expect adding the public key tracking to use more memory; I wonder how Automerge is spending so much more memory. Possibly on a bunch of internal caches or memoization that give the order-of-magnitude improvement in speed?

> Ops: 100k

> Ours (Basic) 9.321s

> Ours (BFT) 38.842s

> Automerge (Rust) 0.597s