samba - Mar 2013 - force user = and guest ok = yes both set: samba 3.6.12 versus 3.6.13

Hello,

when I set

    guest ok = yes

and

    force user = some_user

for a share and a client connects as guest, does samba switch to the
user 'some_user' when it accesses the share's directory? To me it
looks
like samba did do this up to version 3.6.12 but does no longer with
version 3.6.13:

Instead 3.6.13 does switch to the guest user account - in my case to
"nobody".

Please can someone confirm that there was a change from 3.6.12 to 3.6.13
that introduced this new behavior - or am I wrong and something else did
go wrong when I did update? I did read the release notes and tried to
read the source, but couldn't come to a conclusion.

Best regards,

Heiner Billich
-- 
System Engineer Scientific Computing; Paul Scherrer Institut
Heiner.Billich at psi.ch; +41563103602;