Hi!

I have concerns about the resolver replacing A/AAAA records in signed
zones as it breaks validation.

If a resolver understanding ANAME is queried using the DO=1 flag it
shouldn't touch the A/AAAA records, because it already knows the
requestor would through them away.

This also means a caching resolver should store the original A/AAAA
records (and not the ones resolved through ANAME) in the cache.

With this change I don't think it makes sense to say "a resolver MUST
re-query", I'd use "a resolver SHOULD re-query if it didn't use ECS and
the query didn't use DO=1".  But I'd add "a resolver MUST include ANAME
RRset in respones to queries for A/AAAA".

cheers,
Stefan

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