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[3.14] gh-141311: Avoid assertion in BytesIO.readinto() (GH-141333) - #141457
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Fix error in assertion which causes failure if pos is equal to PY_SSIZE_T_MAX. Fix undefined behavior in read() and readinto() if pos is larger that the size of the underlying buffer. (cherry picked from commit 7d54374) Co-authored-by: Cody Maloney <cmaloney@users.noreply.github.com>
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Fix error in assertion which causes failure if pos is equal to PY_SSIZE_T_MAX.
Fix undefined behavior in read() and readinto() if pos is larger that the size
of the underlying buffer.
(cherry picked from commit 7d54374)
Co-authored-by: Cody Maloney cmaloney@users.noreply.github.com