Bug with bad characters in past versions when doing sparse checkout

This thread started on tortoisesvn, here:
http://groups.google.com/group/tortoisesvn-dev/t/ba504f8a58b303d3

It was found to be a svn bug, not tortoise. So I recreated it on the command line (with collabnet svn 1.5.5 I just downloaded a minute ago) and wrote down exactly how to reproduce it. Please see attachments:
                prep_for_problem.txt
                and
                witness_problem.txt

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