bzr version-info crashes with UnicodeEncodeError when comment contains non-ascii string.

C:\home\inada-n\test>bzr init foo
Created a standalone tree (format: 2a)
C:\home\inada-n\test>cd foo
C:\home\inada-n\test\foo>echo foo > foo
C:\home\inada-n\test\foo>bzr add foo
adding foo
C:\home\inada-n\test\foo>bzr ci -m "あいう"
Committing to: C:/home/inada-n/test/foo/
added foo
Committed revision 1.
C:\home\inada-n\test\foo>bzr version-info --all
revision-id: <email address hidden>
date: 2010-10-13 14:11:20 +0900
build-date: 2010-10-13 14:11:49 +0900
revno: 1
branch-nick: foo
clean: True
revisions: id: <email address hidden>
bzr: ERROR: exceptions.UnicodeDecodeError: 'ascii' codec can't decode byte 0xe3 in position 10: ordinal not in range(128
)

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 912, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1112, in run_bzr
  File "bzrlib\commands.pyo", line 690, in run_argv_aliases
  File "bzrlib\commands.pyo", line 705, in run
  File "bzrlib\cleanup.pyo", line 135, in run_simple
  File "bzrlib\cleanup.pyo", line 165, in _do_with_cleanups
  File "bzrlib\cmd_version_info.pyo", line 119, in run
  File "bzrlib\version_info_formats\format_rio.pyo", line 80, in generate
  File "bzrlib\rio.pyo", line 49, in write_stanza
  File "bzrlib\rio.pyo", line 215, in write
  File "bzrlib\ui\text.pyo", line 542, in writelines
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe3 in position 10: ordinal not in range(128)

bzr 2.2.1 on python 2.6.4 (Windows-XP-5.1.2600-SP3)
arguments: ['bzr', 'version-info', '--all']
encoding: 'cp932', fsenc: 'mbcs', lang: 'ja'
plugins:
  bzrtools C:\Program Files\Bazaar\plugins\bzrtools [2.2.0]
  colo C:\Program Files\Bazaar\plugins\colo [0.1.0]
  explorer C:\Program Files\Bazaar\plugins\explorer [1.1.0]
  fastimport C:\Program Files\Bazaar\plugins\fastimport [0.9.0dev]
  launchpad C:\Program Files\Bazaar\plugins\launchpad [2.2.1]
  loom C:\Program Files\Bazaar\plugins\loom [2.2.1dev]
  netrc_credential_store C:\Program Files\Bazaar\plugins\netrc_credential_store [2.2.1]
  news_merge C:\Program Files\Bazaar\plugins\news_merge [2.2.1]
  pipeline C:\Program Files\Bazaar\plugins\pipeline [unknown]
  qbzr C:\Program Files\Bazaar\plugins\qbzr [0.19.2]
  rewrite C:\Program Files\Bazaar\plugins\rewrite [0.6.1]
  svn C:\Program Files\Bazaar\plugins\svn [1.0.4]
  upload C:\Program Files\Bazaar\plugins\upload [1.0.0dev]
  xmloutput C:\Program Files\Bazaar\plugins\xmloutput [0.8.6]

*** 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.