Code review comment for lp://staging/~jspashett/bzr/587868_args_handling_cant_debug

@Jason: Ok, so, I'll put this proposal status to 'Work In progress' then.
From there, you can push new changes to the same branch and set the status back to 'Needs Review', people
that have already review the previous version should be notified and asked to review again.

If you have doubts about how your changes will behave outside of windows, feel free to add more tests and ping me
on IRC #bzr or here, I can help you run these tests on http://babune.ladeuil.net:24842.