On Tue, Sep 27, 2016 at 03:46:16PM -0700,
 Matthew Pounsett <m...@conundrum.com> wrote 
 a message of 137 lines which said:

> My rationale is that if foo.bar.example.org were still a valid name

By "valid name", do you mean "something which existed less than $TTL
seconds ago"?

> at the time that the bar.example.org NXDOMAIN response was issued,
> then NXDOMAIN was not the correct response.  It would be
> inappropriate to answer for foo.bar.example.org out of the cache in
> that case.

The DNS is full of these (minor) inconsistencies. As Mark Andrews
said, temporal issues are not new.

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