[dns-operations] HTTP SRV, was Adding CNAME for the root domain issue

[John Levine]

>But SRV additional data can't tell a client if the apparently missing
>target addresses are actually missing. To avoid the extra round trip, the
>SRV answer needs to be able to say, this target has no A / this target has
>no AAAA.

I don't understand why this is a problem.  Wouldn't the client prefer
the SRV answer to the A/AAAA, so if there's a SRV answer, it doesn't
matter what the A/AAAA answer is?