[micheljansen]

Interesting step, but the decisions taken around concurrency seem to assume small-scale, single-user use cases only. I would be the first to admit I haven't given this enough thought yet, but to me it seems that a global lock and MODSEQ make distributed usage etc. very difficult. Isn't this a step backwards?

[nmjenkins]

No. See my answer to jorangreef above, but essentially this protocol is for server <-> client sync, but you can still do efficient server <-> server sync for distributed backends.