Thanks.
Yes it is, on every single non-Google DNS intended for use by stub resolvers.
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You can’t assume that to be the case. A truncated response with no records is totally fine.
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It's not "totally fine" because it's not usable. You either get a failed lookup or 4x+ latency.
End of conversation
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I'm really not aware of any auth or recursor doing that and rrsets are indivisible for various reasons.
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Again, no other server treats them as "indivisible". This is easily testable.
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It is indeed testable, I sent you a link to OARC with 2 reference implementations few tweets back.
End of conversation
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