Preventing accidental duplicate branching on 1.4.2

We're still using the svn 1.4 branch and I've noticed something that
doesn't seem right to me. As I understand it, the correct way to create
a branch is: svn copy [...]/trunk/ [...]/branches/foo/ -m "Creating foo
branch"

Which works exactly as I expected. If I turn around and immediately run
the same command, which I was expecting to fail because the foo branch
already exists, svn instead creates /branches/foo/trunk/. A third
execution of that same command throws an error because the directory
already exists.

Is that the expected behavior? I'm just worried about svn users
branching twice or accidentally reusing an old branch name.

-- 
Eric Olson
 
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