Fri, 07 Sep 2018 11:17:34 -0400 Boris Feld snapshot: make sure we'll never refine delta base from a reused source
Fri, 07 Sep 2018 11:17:34 -0400 Boris Feld snapshot: turn _refinedgroups into a coroutine
Fri, 07 Sep 2018 11:17:33 -0400 Boris Feld snapshot: also use None as a stop value for `_refinegroup`
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