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From: Eli Zaretskii <eliz@gnu.org>
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Subject: bug#24369: Docu of prefix-numeric-value
Date: Mon, 05 Sep 2016 21:57:58 +0300
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> Cc: drew.adams@oracle.com, 24369@debbugs.gnu.org
> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
> Date: Mon, 5 Sep 2016 20:33:21 +0200
> 
> >     • ‘nil’, meaning there is no prefix argument.  Its numeric value is
> >       1,
> 
> That's the point:
> 
> Value of nil is 1

No, the _numeric_ value of nil is 1.  IOW, nil, when interpreted as a
number, is 1.  An entirely different story.

> Consistency means something different.

The numeric value of nil is consistently 1.