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Author Mike Hommey
Recipients Mike Hommey, bquinlan, davin, diogocp, ned.deily, paul.moore, rbcollins, sbt, steve.dower, terry.reedy, tim.golden, tim.peters, zach.ware
Date 2020-04-07.03:01:48
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This is still a problem in python 3.7 (and, I guess 3.8).

When not even giving a max_workers, it fails with a ValueError exception on _winapi.WaitForMultipleObjects, with the message "need at most 63 handles, got a sequence of length 63"

That happens with max_workers=None and max_workers=61 ; not max_workers=60.

I wonder if there's an off-by-one in this test:
Date User Action Args
2020-04-07 03:01:49Mike Hommeysetrecipients: + Mike Hommey, tim.peters, terry.reedy, paul.moore, bquinlan, rbcollins, tim.golden, ned.deily, sbt, zach.ware, steve.dower, davin, diogocp
2020-04-07 03:01:49Mike Hommeysetmessageid: <>
2020-04-07 03:01:49Mike Hommeylinkissue26903 messages
2020-04-07 03:01:48Mike Hommeycreate