Code review comment for lp:~smoser/curtin/trunk.snap-curtin-helpers

dropped the rpint, and re-ordered the variables.

i really think it makes sense to not change the check for None to false-ish.

its more epxlicit as None, and we're not aware of any uses that are failing.
at very least its not related to this change, so no reason to shove such a change in.