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gh-50644: Forbid pickling of codecs streams (GH-109180)

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Attempts to pickle or create a shallow or deep copy of codecs streams
now raise a TypeError.

Previously, copying failed with a RecursionError, while pickling
produced wrong results that eventually caused unpickling to fail with
a RecursionError.
This commit is contained in:
Serhiy Storchaka 2023-09-10 20:06:09 +03:00 • committed by GitHub
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commit d6892c2b92
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Attempts to pickle or create a shallow or deep copy of :mod:`codecs` streams
now raise a TypeError. Previously, copying failed with a RecursionError,
while pickling produced wrong results that eventually caused unpickling
to fail with a RecursionError.