On Fri, 17 Nov 2023, Ray Bellis wrote:

 Last time this came around I also suggested instead of n times QT
 entries, to use the same method as NSEC does for conveying which RRtypes
 are covered using a single bitmap:

 https://datatracker.ietf.org/doc/html/rfc3845#section-2.1.2

Speaking personally, I am not a fan of NSEC bitmaps when used to encode a small and possibly sparse list of QTYPES. It's relatively complicated to encode / decode and is often inefficient.

I think it would be unwise to make assumptions on how people will use
this feature. They might want to ask for many more records along with
A/AAAA records. If we change a core DNS feature, it should not designed
for a specific DNSSD use case of HTTPS.

Paul

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