git subtree push and split adding "-n<newline>" to commit messages

Whenever I split a subdirectory into a branch via `git subtree split` or (consequently?) when I push a subtree upstream, the commit messages in the new branch/upstream commits have "-n" and a newline prepended to them. It's easiest to demonstrate with split: ``` git init repo cd repo mkdir splitme touch splitme/foo git add splitme/ git commit -m 'Add foo' git subtree split -P splitme -b splitme-only ``` From this, I get: ``` $ git log master commit 6d5164076bd88d1dab8963d91ec013372e58a444 Author: me Date: Fri Jul 26 12:22:27 2013 -0500 Add foo ``` and ``` $ git log splitme-only commit 6ce8124a0b5e52d4bba198144d2f3f664d7b19e7 Author: me Date: Fri Jul 26 12:22:27 2013 -0500 -n Add foo ``` As you can see, the "splitme-only" branch has "-n" prepended to the commit message. This is particularly bad as github collapses everything but the first line by default. Hence, you can't easily skim these commit messages on github. I've tried using `--annotate` to maybe get something more readable, but that just appends something to the "-n" line. The behavior is identical for `subtree push`. Is there any way to prevent the "-n" line from being added? I could rebase the line out, but when I played around with that it broke subtrees merging. Am I doing something wrong? Using git 1.8.3.4 on OS X 10.8.4.