Shouldn't git-am be able to pass -b to git-mailinfo?

Hi,

I've been wondering:  git-am can pass -k to git-mailinfo, but not -b.
It's thus impossible to preserve a commitmsg starting with a bracketed
text.

Consider a commitmsg starting with '[ISSUE-1234] Fix breakage in XY.'
git format-patch produces:

    ...
    Subject: [PATCH] [ISSUE-1234] Fix breakage in XY.
    ...

Applying this patch using git-am results in commit message starting
either with

    Fix breakage...

or, using git-am -k, with

    [PATCH] [ISSUE-1234] Fix...

However, there is no way to get the original commit message using
git-am's interface.  Or am I missing something?

I'd supply a patch straight away, however, I can't think of a long
version of -b option to go well with -k/--keep. Any ideas?

-- 
Jan Winkler [off-list ref]