[3.8] bpo-39681: Fix C pickle regression with minimal file-like objects (GH-18592) #18630
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Fix a regression where the C pickle module wouldn't allow unpickling from a
file-like object that doesn't expose a readinto() method.
(cherry picked from commit 9f37872)
Co-authored-by: Antoine Pitrou antoine@python.org
https://bugs.python.org/issue39681