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Author serhiy.storchaka
Recipients Arfrever, alexandre.vassalotti, barry, josh.r, kitterma, nadeem.vawda, pitrou, python-dev, serhiy.storchaka
Date 2016-01-11.17:50:02
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Therefore my guess was true. There is a bug in Cython. It creates classes that can't be correctly unpickled or copied.

The question is wherever we should replace TypeError with a warning in maintained releases, or remove this check at all? Here is a patch against 3.5 that replaces TypeError with a warning.
Date User Action Args
2016-01-11 17:50:03serhiy.storchakasetrecipients: + serhiy.storchaka, barry, pitrou, alexandre.vassalotti, nadeem.vawda, Arfrever, kitterma, python-dev, josh.r
2016-01-11 17:50:03serhiy.storchakasetmessageid: <>
2016-01-11 17:50:03serhiy.storchakalinkissue22995 messages
2016-01-11 17:50:02serhiy.storchakacreate