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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Confused by y-or-n-p
Date: Sat, 26 Dec 2020 12:49:34 +0200
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> From: Richard Stallman <rms@gnu.org>
> Cc: eliz@gnu.org, emacs-devel@gnu.org
> Date: Sat, 26 Dec 2020 05:24:17 -0500
> 
> What was the reason for implementing this change in the
> single-character-answer commands?  Who actually wanted the change in
> behavior?  And for what use cases?

AFAIR, the implementation was changed to provide the following
advantages:

  . allow having history for single-character-answer commands
  . avoid hiding the prompt when async messages arrive