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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: file-exists-p on empty string
Date: Wed, 27 Feb 2019 18:55:37 +0200
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To: Michael Albinus <michael.albinus@gmx.de>
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> From: Michael Albinus <michael.albinus@gmx.de>
> Date: Wed, 27 Feb 2019 17:01:29 +0100
> 
> Btw, several other basic file name operations behave similar. Try
> (file-attributes "") or (file-readable-p "") or (file-directory-p "") .

All of them call expand-file-name internally, no?