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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Faces: How to clear an attribute while continuing to inherit
 other attributes?
Date: Fri, 11 Oct 2019 11:36:17 +0300
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To: Dave Goel <deego3@gmail.com>
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 (message from Dave Goel on Thu, 10 Oct 2019 20:56:56 -0400)
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> From: Dave Goel <deego3@gmail.com>
> Date: Thu, 10 Oct 2019 20:56:56 -0400
> Cc: Davis Herring <herring@lanl.gov>
> 
>  That's what 'unspecified' does, and it clearly isn't what Dave
>  wanted.  He wanted a value that says "clear that attribute", and
>  there's no such value.
>  
> But, again, nothing stops us from providing one.

Nothing, except someone who'd sit down and write the code that makes
sense in related situations.