git clean --exclude broken?

I think I have found a new bug in 1.7.5:
# Setup:
mkdir tmp && cd tmp
git init
mkdir foo && touch foo/bar
mkdir bar && touch bar/baz
echo "/foo" > .gitignore
echo "/bar" >> .gitignore
git add .gitignore
git commit -m ignore

# The problem (Why is foo/ removed?)
$>git clean -dXf --exclude=/foo
Removing bar/
Removing foo/

I apologize if this isn't the correct channel to report a bug. Does anyone know if this is a known issue?

Thanks,
Todd Rinaldo