[issue39492] reference cycle affecting Pickler instances (Python3.8+)

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Thank you for the PR!

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39492>
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