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bug#20623: XML and HTML files with encoding/charset="utf-8" declaration

From: Vincent Lefevre
Subject: bug#20623: XML and HTML files with encoding/charset="utf-8" declaration loose BOM; Coding system is reset from utf-8-with-signature to utf-8 on save
Date: Sat, 11 Aug 2018 17:41:01 +0200
User-agent: Mutt/1.10.1+58 (10c1ac4b) vl-108074 (2018-07-29)

On 2018-08-11 13:45:17 +0300, Eli Zaretskii wrote:
> > Date: Sat, 11 Aug 2018 12:13:41 +0200
> > From: Vincent Lefevre <address@hidden>
> > Cc: address@hidden, address@hidden, address@hidden,
> >     address@hidden, address@hidden
> > 
> > On 2018-08-11 12:15:31 +0300, Eli Zaretskii wrote:
> > > In this case, I cannot but express my extreme surprise to see such a
> > > minor issue described as "grave".  The alleged data loss is minor, if
> > > it exists at all (the BOM is not data important for the user,
> > 
> > You're completely wrong. The presence of BOM or not is very important
> > for some applications, such as Firefox (not to determine the charset,
> > but the MIME type of local files).
> Please provide the details, including the use case, if possible.  I'm
> still in the dark regarding the importance of the BOM in UTF-8 encoded
> HTML stuff.


for HTML. Wontfix because of:


For text/plain only (but this is another example that BOM can matter
in practice), there's


(which is a bug that should be fixed).

> > It can be repaired, but the problems are the user doesn't know
> > what's going on and this breaks things.
> I agree about the user not knowing, but that doesn't yet qualify as
> "data loss", which has an widely accepted meaning.

This is data corruption, which is a form of data loss, because some
information is lost in the process (I recall that Emacs does not
provide any information to the user about this transformation).

Vincent Lefèvre <address@hidden> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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