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From: Florian Weimer <fw@deneb.enyo.de>
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Subject: Re: Using iso-8859-15 with Emacs21 & Gnus
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ShengHuo ZHU <zsh@cs.rochester.edu> writes:

>> because the standard utf-8.el can deal with ISO-8859-1, but not
>> ISO-8859-15.
>
> That's the problem of utf-8.el.

It completely breaks UTF-8 support for Gnus using Emacs 21.  If you
reply to a UTF-8 message, chances are good that it contains ISO-8859-1
characters, and if I understand your code correctly, these characters
are mapped to ISO-8859-15, so the reply cannot be encoded using UTF-8
by Emacs.

But I agree that utf-8.el should support more charsets.