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Date: Sat, 20 Jul 2013 12:28:17 +0300
From: Eli Zaretskii <eliz AT gnu DOT org>
Subject: Re: Set _IOERR if the file stream has been opened in wrong mode.
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> Date: Sat, 20 Jul 2013 11:23:14 +0200
> From: Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
> 
> I do not know if it is worth to clarify that this feature is not standard
> mandated but only added for compatibility with the major open source c libraries.

No need, IMO.  AFAIU, this is undefined behavior, so we can change
that at will.