pushes a checkout

I've hit this a few times now.

Create:
 - a 2a repo with no working trees
 - inside that a lightweight checkout to a branch in the repo
 - a project on lp that is in a non-2a, stackable format
 - cd to the checkout,
 - init a repo on lp to permit pushing
 - push, and the result is a lightweight checkout on lp pointing at
local disk.

bzr init-repo --no-working-trees .
bzr init trunk
bzr checkout trunk working
cd working
bzr init-repo lp:~user/drizzle/demo --no-working-trees
bzr push lp:~user/drizzle/demo
lftp sftp://bazaar.launchpad.net/~user/drizzle/demo
cat .bzr/branch/format

 affects bzr
 importance high
 status confirmed

(high because this will confuse the hell out of repository users).