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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Coding systems vietnamese-vscii and vietnamese-tcvn
Date: Fri, 21 Jul 2023 16:06:09 +0300
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> From: Ulrich Mueller <ulm@gentoo.org>
> Cc: emacs-devel@gnu.org
> Date: Fri, 21 Jul 2023 14:52:55 +0200
> 
> >>>>> On Fri, 21 Jul 2023, Eli Zaretskii wrote:
> 
> > Why is the fact that we have two separate coding systems a problem in
> > this case?
> 
> Presumably it works fine as-is, but is there any benefit of having such
> duplication?

I cannot see any clear benefits either way.

Maybe we need to ask Vietnamese users.  The comments in
lisp/language/vietnamese.el say that vscii is deprecated.