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Sylvain-

> What's the default behaviour if we aren't providing the proximity qparam
> ? Isolate or any ?

What we've been talking about, per mriedem's suggestion, is that the
qparam is required when you specify any numbered request groups.  There
is no default.  If you don't provide the qparam, 400.

(Edge case: the qparam is meaningless if you only provide *one* numbered
request group - assuming it has no bearing on the un-numbered group.  In
that case omitting it might be acceptable... or 400 for consistency.)

-efried