More robust way of choosing a non-existant uid (faster, too). (Correct version -- the previous checkin was a keyboard slip.)
More robust way of choosing a non-existant uid (faster, too).
(Correct version -- the previous checkin was a keyboard slip.)

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator