> Well we could add a mode that checks for non-glue below bottom of
> zone but it would have to be documented as being beyond what it
> technically required.  This policy not correctness enforcement.

It'd be nice to have this as a warning feature (it doesn't need to be specific, just to indicate that there *are* RRsets that are being occluded by subdomain delegation so that the zone owner who has opted to check their zone content, can investigate further themselves.

Leaving it here to be considered as a feature request rather than as a bug report.