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Author brett.cannon
Recipients Antony.Lee, barneygale, brett.cannon, pitrou
Date 2020-03-03.18:08:24
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Message-id <1583258904.52.0.825119549098.issue39682@roundup.psfhosted.org>
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Content 
> Can I ask what sort of backwards-compatibility guarantees Python provides for these cases?

A deprecation warning for two releases (i.e. two years). Then it can be removed. So if people want to move forward with removing this then a DeprecationWarning would need to be raised in all places where _closed is set with a message stating the functionality is deprecated in 3.9 and slated for removal in 3.11 (along with appropriate doc updates, both for the module and What's New).
History
Date User Action Args
2020-03-03 18:08:24brett.cannonsetrecipients: + brett.cannon, pitrou, Antony.Lee, barneygale
2020-03-03 18:08:24brett.cannonsetmessageid: <1583258904.52.0.825119549098.issue39682@roundup.psfhosted.org>
2020-03-03 18:08:24brett.cannonlinkissue39682 messages
2020-03-03 18:08:24brett.cannoncreate