* Viktor Dukhovni:

> It would be nice if unbound were able to enforce "delegation-only"
> zones that contain only delegations and glue.  This would be useful
> for the root zone and various TLDs.  Otherwise, such zones can
> return apparently valid signed responses that should have been
> delegated to a child zone, but for some reason were not.

There are very few strictly-delegation-only zones, and zones change
there status over time, so this feature seems fairly risky.  The ISC
recommendations for BIND make recursors subject to denial-of-service
attacks that prevent name resolution for entire TLDs.
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