Matthieu Moy [off-list ref] writes:
(I ended up doing "strace -e open git rev-parse git-svn", and found
out I had a .git/git-svn file lying around)
This has been proposed for a couple of times now but I think it might be
time to start insisting on a ref directly underneath $GIT_DIR to be in all
caps (plus underscore) to avoid issues like this while still allowing
traditional MERGE_HEAD, ORIG_HEAD and friends.