[issue28416] defining persistent_id in _pickle.Pickler subclass causes reference cycle

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:


New changeset c91bf742e542dceaf71042a44b5a04fb08bdda70 by Serhiy Storchaka (Miss Islington (bot)) in branch '3.6':
bpo-28416: Break reference cycles in Pickler and Unpickler subclasses (GH-4080) (#4653)
https://github.com/python/cpython/commit/c91bf742e542dceaf71042a44b5a04fb08bdda70


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<https://bugs.python.org/issue28416>
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