bisect: simpler approach for option validation message
Yuya Nishihara gave this suggestion on the mailing list after the
previous patch was queued, and honestly this seems much simpler and
looks more efficient.
Martin von Zweigbergk <martinvonz@google.com> [Mon, 12 Jun 2017 16:35:57 -0700] rev 32822
pushkey: use False/True for return values from push functions
It was particularly unclear in phases.pushphase() whether the 0/1
returned were the 0/1 for public/draft phase or for False/True