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[3.14] gh-132551: make `io.BytesIO` thread safe (GH-132616) (#138551)

* [3.14] gh-132551: make `io.BytesIO` thread safe (GH-132616)
(cherry picked from commit 5dd3a3a58cca4798ebfc2edd673211067453e81e)

Co-authored-by: Tomasz Pytel <tompytel@gmail.com>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>
K
Kumar Aditya committed
23cc8f789d8366573cf12c4495b5a4c9afa64005
Parent: bf397e2
Committed by GitHub <noreply@github.com> on 10/7/2025, 6:18:28 PM