Fri, 07 Sep 2018 11:17:33 -0400 Boris Feld snapshot: add refining logic at the findeltainfo level
Fri, 07 Sep 2018 11:17:32 -0400 Boris Feld snapshot: use None as a stop value when looking for a good delta
Fri, 07 Sep 2018 11:17:32 -0400 Boris Feld snapshot: introduce an intermediate `_refinedgroups` generator
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