Looking at code, the way multi currently works is that either the entire
thing fails with an exception, or multiresponse is returned with exactly
one result/exception per action in multiaction, in corresponding order.
This sounds like a reasonable API contract, but it could be "by accident".
Do you think we can rely on this remaining true?
That way I can remove passing action index from client back and forth thru
the server (with backward compat ofc).
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