* Tony Finch:

> What does 2 return to 3? It can't send a signed NSEC because DO=0.

ANY is special, you can get NSEC and RRSIG in responces with DO=0
(some implementations do that).  With suitably aligned TTLs, I suppose
you can even end up with just a NSEC/RRSIG RRset pair.

NSEC3 is different because of the QNAME mismatch.  There, the problem
you describe actually exists, I think.

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