[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 986375ebde0dd5ff2b7349e445a06bd28a3a8ee2 by Serhiy Storchaka in branch 'master':
bpo-28416: Break reference cycles in Pickler and Unpickler subclasses (#4080)
https://github.com/python/cpython/commit/986375ebde0dd5ff2b7349e445a06bd28a3a8ee2


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