bzr crashes on 'bzr help x' where x is unicode alias

[~]% bzr alias €
bzr alias €="st"
[~]% bzr €
bzr: ERROR: Not a branch: "/home/parthm/".
[~]% bzr help €
bzr: failed to report crash using apport:
     OSError(17, 'File exists')
bzr: ERROR: exceptions.UnicodeEncodeError: 'ascii' codec can't encode character u'\u20ac' in position 5: ordinal not in range(128)

Traceback (most recent call last):
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/commands.py", line 912, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/commands.py", line 1112, in run_bzr
    ret = run(*run_argv)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/commands.py", line 690, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/commands.py", line 705, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/commands.py", line 1127, in ignore_pipe
    result = func(*args, **kwargs)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/builtins.py", line 4228, in run
    bzrlib.help.help(topic)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/help.py", line 58, in help
    " ".join(alias)))
UnicodeEncodeError: 'ascii' codec can't encode character u'\u20ac' in position 5: ordinal not in range(128)

bzr 2.3.0dev1 on python 2.6.5 (Linux-2.6.32-24-generic-i686-with-Ubuntu-10.04-lucid)
arguments: ['/home/parthm/src/bzr.dev/trunk/bzr', 'help', '\xe2\x82\xac']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_IN'
plugins:
  bash_completion /storage/parth/src/bzr.dev/trunk/bzrlib/plugins/bash_completion [2.3.0dev1]
  bzrtools /home/parthm/.bazaar/plugins/bzrtools [2.2.0]
  etckeeper /usr/lib/python2.6/dist-packages/bzrlib/plugins/etckeeper [unknown]
  grep /home/parthm/.bazaar/plugins/grep [0.5.0dev]
  keywords /home/parthm/.bazaar/plugins/keywords [unknown]
  launchpad /storage/parth/src/bzr.dev/trunk/bzrlib/plugins/launchpad [2.3.0dev1]
  netrc_credential_store /storage/parth/src/bzr.dev/trunk/bzrlib/plugins/netrc_credential_store [2.3.0dev1]
  news_merge /storage/parth/src/bzr.dev/trunk/bzrlib/plugins/news_merge [2.3.0dev1]
  plugin_info /home/parthm/.bazaar/plugins/plugin_info [1.3.0dev]
  search /home/parthm/.bazaar/plugins/search [1.7.0dev]
  svn /home/parthm/.bazaar/plugins/svn [1.0.4dev]
  touch /home/parthm/.bazaar/plugins/touch [1.1]
  upload /home/parthm/.bazaar/plugins/upload [1.0.0dev]

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.
[~]%