BUG - git clean

Passing to git clean wrong (non-existent) paths together with valid ones, causes it to delete stuff that it shouldn't. Am I right?
Script to reproduce:

mkdir test
cd test
git init .
mkdir ba
mkdir ba/ca

# So far so good.
# Should clean directory "ba/ca"
git clean -dn -- ba/ca

# Should clean "ba/ca" and ignore non-existent "j" # Instead, it wants to delete "ba" totally. git clean -dn -- ba/ca j

git --version

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Output:

+ mkdir test
+ cd test
+ git init .
Initialized empty Git repository in /home/notroot/test/.git/
+ mkdir ba
+ mkdir ba/ca
+ git clean -dn -- ba/ca
Would remove ba/ca/
+ git clean -dn -- ba/ca j
Would remove ba/
+ git --version
git version 1.7.9.5

---------------------------------------------------------------------

Thanks!
Noam

actually, my git will also do it wrong when 'j' exist, do these after your script:

$ git clean -dn ba/ca j
Would remove ba/
$ mkdir j
$ git clean -dn ba/ca j
Would remove ba/ #here missing 'ca'
Would remove j/

I think it's the problem of directory path manipulation.