Subject: bug#13226: 24.3.50; set-file-acl on MS Windows shall check ACL string format

From: Eli Zaretskii <[email-masked]>
Date: Wed, 19 Dec 2012 23:18:06 +0200

> From: Stefan Monnier <[email-masked]>
> Cc: Michael Albinus <[email-masked]>,  [email-masked],  [email-masked]
> Date: Wed, 19 Dec 2012 13:36:43 -0500
> 
> I don't think we should document that file-acl returns a string.
> The representation should be documented as undocumented and prone to
> change (ideally opaque).

Currently, it could be either a string or nil.  The latter means "no
ACL".  Do you want to undocument both of these possibilities?  It
sounds too radical to me.