git-note -C changes commit type?

Hi,

judging from the documentation I got the impression that I can pass any git object has to "git note -C <hash>" and it would stored as-is. But it seems the objects gets mangled somehow...

(I want to attach a commit object as a note, to reference the history of a feature before the final cleanup rebase. For that I turn the reflog into a series of commits, and the final commit is the one I want to store there.)

$ mkdir foo
$ cd foo/
$ echo foo > a
$ git init
Initialisierte leeres Git-Repository in /tmp/foo/.git/
$ git add a
$ git commit -m 'A commit'
[master (Basis-Commit) 3d7de37] A commit
 1 file changed, 1 insertion(+)
 create mode 100644 a
$ echo foo2 > a
$ git commit -m 'A commit 2' -a
[master e1bfac4] A commit 2
 1 file changed, 1 insertion(+), 1 deletion(-)
$ git notes --ref history add -C 3d7de37 e1bfac4
$ git ls-tree notes/history
100644 blob 5b73d5152e6207e3a2b67e57ca3a2cb94d12061e e1bfac434ebd3135a3784f6fc802f235098eebd0

I was expecting 3d7de37 to be referenced here.

Is that a bug, or is storing commits as notes not supported?

Thanks, Joachim