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py3: filter() now returns a generator, so wrap when we need a list
Sun, 14 Jul 2019 22:34:36 -0700, by Martin von Zweigbergk
py3: don't depend on map() iterating over its input
Fri, 12 Jul 2019 23:19:50 -0700, by Martin von Zweigbergk
py3: implement __bool__ in addition to __nonzero__
Thu, 11 Jul 2019 16:49:01 -0700, by Martin von Zweigbergk
py3: replace iter.next() by next(iter)
Thu, 11 Jul 2019 14:21:23 -0700, by Martin von Zweigbergk

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