odd name-rev behavior?

Never noticed this before - is this expected? It doesn't seem to
match documentation, in any case...

Basically, 'git name-rev --all' lists a lot of lines that are
marked as "undefined", and most, if not all, of the objects
represented are trees, not commits... I wouldn't have expected
name-rev to follow the link from a commit to a tree and try to
process that result...

git --version

git version 1.7.7.3

git name-rev --all | tail -10

ed858730bc0e40d5317543ca4a199f1902b1c545 master~35
ea6d0d16af77b357caab59bda3eff8efe78370c1 undefined
ea01449260d4ed49cc30ffff8fa840273e182195 undefined
f0a186fa05e9d4dd2de85ab537ac019a74b84736 undefined
f223486e4178e0b2d6645fa3d0478602a6aec548 undefined
f6f969d943f981057d9243d5fc2d8a79864cb542 master~19
f73dc68c32681939d2ce92378128889c7b6a8902 master~90
f739f050f0a20692e947604d0d5a464cdd5393aa master~109
faa7bf622b69c93f1f21eec0de3bd0ab6957b888 master~94
ff41d4390d3fabf1ba886749a51a20722b159fdd undefined

git cat-file -t ff41d4

tree

-- 
+----------------------+
| Tim Walberg          |
| 830 Carriage Dr.     |
| Algonquin, IL 60102  |
| twalberg@comcast.net |
+----------------------+