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What do you think of Capn' proto?

It's very different to grpc, lacking streaming semantics but offering capabilities, which are certaintly nice.

True, streaming is not a baked-in feature of Cap'n Proto. Streaming can, however, be implemented on top of capabilities, as with this ByteStream interface: https://github.com/sandstorm-io/sandstorm/blob/v0.197/src/sa...