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This is a big re-write to move to an architecture based on Redis (instead of implementing our own actor/messaging system, which could become a big headache down the road). We'll benefit from Redis' speed and support.
We probably would have needed Redis anyways for pubsub stuff, so might as well start now.
This PR doesn't have this implemented yet, but it should be easy to switch to a Redis Cluster as well (there's no good rust library for it yet).
These changes also make the APIs for the end-user a lot simpler and cleaner. There's still more testing/experimentation needed to check if it's flexible enough, but so far it seems good.