> A DNS lookup with a QTYPE of A returns ALL of the A records the queried serv$

...and, if it doesn't have any and doesn't have a cached indicating
that there aren't any (and recursion is being provided) it will go and
look up what it can find.  Right.

> There is NOTHING in the DNS protocol for a client to signal that it prefers $

Isn't that what the QTYPE is for?

As far as I can tell, the only way to ever get both A and AAAA in the
answer section to a single query is to query for type ANY, which isn't
usually done because of the way ANY queries interact with caches.

> BTW, it's "IP address" not "IP".

I think I disagree.  Adjectives (and nouns functioning as adjectives),
in the presence of sufficient context to disambiguate, not infrequently
have the noun they're modifying stripped for brevity.

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