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Put the target channel name and a message id at the front of each key and you can use a tuple space for IPC.

What I mean is: can a process block until a particular key appears, then resume execution after receiving the associated value? That's the main differentiating feature of a tuple space, and it wasn't clear to me whether this system supports that or not (or even has a concept of a process).

No, that's not supported at present, but that's an interesting idea.

Workers don't have the concept of processes. The unit of compute is an individual event -- e.g. handling an individual HTTP request. So we'd have to augment it a bit, but we can probably come up with something useful.

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