dovecot - Jun 2011 - ACLs: Group ACL adds empty ACL for user of same name, why?

I'm playing around with ACLs, Groups and SOGo on Debian Stable, Dovecot 
1.2.15.

If I set an ACL for a group 'developers':

6 setacl "INBOX.Trash" "$developers" "lrsw"
6 OK Setacl complete.

The dovecot-acl file for INBOX.Trash then contains a group setting for the 
group, and a user setting for a user of the same name, giving it no 
permissions.

group=developers lrws
user=developers

and a subsequent GETACL reports the user:

5 getacl "INBOX.Trash"
* ACL "INBOX.Trash" "$developers" lrws
"developers" "" "jim" lrwstipekxacd
5 OK Getacl completed.

Currently SOGo does not deal well with the unexpected non-existant user.
So I'm curious - why's it there? 
-- 
Jim Hague - jim.hague at acm.org          Never trust a computer you can't
lift.

On Mon, 2011-06-27 at 14:40 +0100, Jim Hague wrote:
> I'm playing around with ACLs, Groups and SOGo on Debian Stable, Dovecot
> 1.2.15.
> 
> If I set an ACL for a group 'developers':
> 
> 6 setacl "INBOX.Trash" "$developers" "lrsw"
> 6 OK Setacl complete.
> 
> The dovecot-acl file for INBOX.Trash then contains a group setting for the 
> group, and a user setting for a user of the same name, giving it no 
> permissions.
> 
> group=developers lrws
> user=developers
Looks like a bug. I see it's fixed in v2.0 already. You can't get it
fixed to Debian stable .deb anyway, so I don't think there's much point
in trying to backport the fix.