GNU bug report logs - #65051
internal_equal manipulates symbols with position without checking symbols-with-pos-enabled.

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Message #95 received at 65051 <at> debbugs.gnu.org (full text, mbox):

From: Alan Mackenzie <acm <at> muc.de>
To: Dmitry Gutov <dmitry <at> gutov.dev>
Cc: 65051 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#65051: internal_equal manipulates symbols with position
 without checking symbols-with-pos-enabled.
Date: Fri, 11 Aug 2023 10:42:10 +0000

Hello, Dmitry.

On Fri, Aug 11, 2023 at 03:51:09 +0300, Dmitry Gutov wrote:
> On 08/08/2023 18:33, Alan Mackenzie wrote:
> >> So I'm still wondering why you think it's a bug.
> > Because it violates the definition and basic understanding of equal.
> > It's a special case when no special case is needed.

> Does 'equal'-ity of strings with and without text properties (or with 
> different text properties) violate these as well?

Maybe, maybe not.  It depends on whether you consider the text
properties on a string (or buffer portion) an essential part of the
string or not.  I think it was possibly a design error to have text
properties conceptually as a part of a string/buffer rather than
something associated with it, like an overlay.  The fact that equal
ignores these properties supports this view.

-- 
Alan Mackenzie (Nuremberg, Germany).

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