bug#36649: 27.0.50; pure space and pdumper

[Eli Zaretskii]

> From: Pip Cet <pipcet@gmail.com>
> Date: Fri, 5 Mar 2021 03:00:03 +0000
> Cc: Robert Pluim <rpluim@gmail.com>, Andreas Schwab <schwab@linux-m68k.org>,
>  Stefan Kangas <stefankangas@gmail.com>, 36649@debbugs.gnu.org, 
> larsi@gnus.org,
>  Andrea Corallo <akrl@sdf.org>
> 
> > The convention is to put a "verify (NIL_IS_ZERO);" near the rare bits of
> > code that assume Qnil is all-bits-zero.
> 
> That would be nice, but I'm quite certain there are places in the code
> that rely on this identity without doing that...

There shouldn't be.  If you find them, please report them.