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From: Juri Linkov <juri@linkov.net>
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Subject: bug#63626: [PATCH] Make forward and backward-to-word arg optional
Date: Mon, 29 May 2023 19:46:59 +0300
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Cc: Eli Zaretskii <eliz@gnu.org>, Zaz Brown <zazbrown@zazbrown.com>,
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> I have no opinion about how this 'should work'.
> I was just confused by the docstring, and I assumed from the docstring,
> that the intention was for the argument to be optional like in
> forward-word/line

Aren't all forward-like commands more permissive and allow their arg
to be optional?  It looks like the standard signature, e.g.:

  (defun forward-page (&optional count)
    (interactive "p")
    (or count (setq count 1))

  (defun forward-paragraph (&optional arg)
    (interactive "^p")
    (or arg (setq arg 1))

  (defun forward-sentence (&optional arg)
    (interactive "^p")
    (or arg (setq arg 1))

  ...