Fri, 07 Sep 2018 11:17:33 -0400 Boris Feld snapshot: also use None as a stop value for `_refinegroup`
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 tip