rm can accidentally delete dirs

Toying with rm today, and came across this situation.
You've got a file called "-n". Now, rm will interperet
'rm -n' as an argument (this isn't the bug). So you go
'rm -- -n', and everything is fine.

However, since it tries to interperet these filenames
as arguments, some problems come up.
Say you've got a file called '-rf', a file called
test,  and a dir called testdir.

rm *f t*    should delete '-rf' and the  test file,
leaving the directory, however, it interperates -rf as
arguments, deleteing the folder and its contents. (It
also leaves the -rf file).

 -- Kavity and naka

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