git init permissions?

Hi list,

Maybe a silly question but I couldn't figure out the answer.

I'm looking at the git init --shared=group result and see:

drwxrwsr-x 7 ferry ferry  111 2009-04-14 19:51 .
drwxrwxr-x 3 ferry ferry   17 2009-04-14 19:51 ..
drwxrwxr-x 2 ferry ferry    6 2009-04-14 19:51 branches
-rw-rw-r-- 1 ferry ferry  127 2009-04-14 19:51 config
-rw-rw-r-- 1 ferry ferry   58 2009-04-14 19:51 description
-rw-rw-r-- 1 ferry ferry   23 2009-04-14 19:51 HEAD
drwxrwxr-x 2 ferry ferry 4.0K 2009-04-14 19:51 hooks
drwxrwxr-x 2 ferry ferry   20 2009-04-14 19:51 info
drwxrwsr-x 4 ferry ferry   28 2009-04-14 19:51 objects
drwxrwsr-x 4 ferry ferry   29 2009-04-14 19:51 refs

Is there some kind of reason that the branches directory is
not created with +s permissions?

I can understand it for the hooks and info directories since
you can not push into those. You _can_ however push into
branches and I would expect it to have +s too, like objects
and refs.

Bug or my misunderstanding?

git version 1.6.0.6