git describe --contains --abbrev=0 <sha1> doesn't work as expected

Hello,

Basically doing: git describe --abbrev=0 <sha1> gives the closest tag
from <sha1>

I would expect adding "--contains" option would give the closest tag
containing <sha1> but it seems that --abbrev=0 has no more effect in
that case:

$ git describe --tags --contains --abbrev=0
7f285fa78d4b81b8458f05e77fb6b46245121b4e
v2.6.35-rc5~14^2~4

Is that expected ?

Thanks
-- 
Francis