[BUG] git-svn fails to rename files with %20 in filename

Someone accidentally checked some files containing "%20" in their names into our svn repository, which is accessed with either svn or git-svn depending on the developer. When I attempted to correct this by renaming the file, I received (on dcommit): Filesystem has no item: File not found: revision 1, path '/theBeginningOfTheOriginalFileName theRestOfTheOriginalFilename' at /home/wpalmer/libexec/git-core/git-svn line 576

A recipe for reproducing this bug is as follows:
#!/bin/bash
temp="$(mktemp -t -d 'git-svn.XXXXXXXXXX')"
[ -n "$temp" ] || { echo "Failed to create temporary directory" >&2;
exit 1; }
function _cleanup(){
	rm -rf "$temp"
}
trap _cleanup INT EXIT
cd "$temp" || exit 1

set -x svnadmin create svn-repos && svn co file://$PWD/svn-repos svn-wc && cd svn-wc && touch 'foo%20bar' && svn add 'foo%20bar' && svn ci -m 'add foo%20bar' && cd .. && git svn clone file://$PWD/svn-repos git-wc && cd git-wc && git mv 'foo%20bar' 'foo-bar' && git commit -m 's/%20/-/ in filename' && git svn dcommit # BUG HERE