Serhiy Storchaka added the comment:
I think that reference loop breaker should be smarter. If we have a loop
A ⇄ B → C → D
then the order of the finalization of A and B is not defined, but B should be
finalized before C and C before D. This should fix unintentional issues with
chained io classes because they have no back references.
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<http://bugs.python.org/issue22996>
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