In further support of preserving sibling records when target chasing
comes back negative, I'd like to further explore my offhand mention of
"A and/or AAAA records".
For a domain owner wanting to use a currently IPv4-only service provider
(names withheld) while still supporting IPv6, the logical approach would
be configuring an ANAME record with one or more AAAA siblings. But that
won't work if the AAAA NODATA response from chasing the ANAME target is
allowed to override those siblings with nothing. This seems to force a
needless choice between abandoning the provider or abandoning IPv6.
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