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To be honest, I don't really understand the point of Cap'n Web.. it's a slightly better JSON-RPC I guess?

I'm a fan of Cap'n Proto, but I don't understand how Cap'n Web is in any way related to it nor what makes it a big deal.

The selling point is promise pipelining, being able to do many chained operations with a single api call

This includes the freaky way they found to make this work with map

OP here, and yes, the chained operations are excellent. Having built this, and now using it some pet projects, that is the part I'm finding valuable.