oh, and the proof for branch-formats:

[Robert Collins]

robertc at lifelesslap:~$ ~/source/baz/branch-formats/bzr upgrade
sftp://rookery.ubuntu.com/home/robertc/public_html/baz2.0/tags
starting upgrade of
sftp://rookery.ubuntu.com/home/robertc/public_html/baz2.0/tags/
making backup of tree history
sftp://rookery.ubuntu.com/home/robertc/public_html/baz2.0/tags/.bzr/ has
been backed up to
sftp://rookery.ubuntu.com/home/robertc/public_html/baz2.0/tags/.bzr.backup/
if conversion fails, you can move this directory back to .bzr
if it succeeds, you can remove this directory if you wish
starting upgrade from format 5 to 6
adding prefixes to weaves
adding prefixes to revision-store
finished

-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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