unicode unsupported

If you create a SVN repository with files whose names are non-ASCII, svn2bzr fails to convert the repositories:

: tfheen@golem /tmp/trunk > ./svn2bzr.py ../d/dump blah
Revision 0 read
/usr/lib/python2.5/site-packages/bzrlib/osutils.py:859: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal
  if head == base:
Traceback (most recent call last):
  File "./svn2bzr.py", line 1073, in <module>
    main()
  File "./svn2bzr.py", line 1066, in main
    opts.prefix, opts.filter)
  File "./svn2bzr.py", line 999, in svn2bzr
    creator.run()
  File "./svn2bzr.py", line 471, in run
    self.add_file(node_path, content)
  File "./svn2bzr.py", line 214, in add_file
    abspath = brt.tree.abspath(path_brt)
  File "/usr/lib/python2.5/site-packages/bzrlib/workingtree.py", line 384, in abspath
    return pathjoin(self.basedir, filename)
  File "/usr/lib/python2.5/posixpath.py", line 65, in join
    path += '/' + b
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1: ordinal not in range(128)
: tfheen@golem /tmp/trunk >

I'll attach the repository dump, it was generated by the following sequence:

: tfheen@golem /tmp/d > svnadmin create dir
: tfheen@golem /tmp/d > mkdir tmp
: tfheen@golem /tmp/d > cd tmp
: tfheen@golem /tmp/d/tmp > svn co file:///tmp/d/dir
Sjekket ut revisjon 0.
: tfheen@golem /tmp/d/tmp > cd dir
: tfheen@golem /tmp/d/tmp/dir > touch æøå
: tfheen@golem /tmp/d/tmp/dir > svn add æøå
A æøå
: tfheen@golem /tmp/d/tmp/dir > svn ci æøå -m'Blah'