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gh-154577: Fix data race in Modules/cjkcodecs/multibytecodec.c
Prevent race by adding `@critical_section` to functions that have `MultibyteIncrementalEncoderObject` or `MultibyteIncrementalDecoderObject` argument Fix TSAN-0001 from gh-153852
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‎Misc/NEWS.d/next/Library/2026-07-24-14-13-38.gh-issue-154577.2d3roU.rst‎

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Fix data race of `MultibyteIncrementalEncoderObject` and
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`MultibyteIncrementalDecoderObject`

‎Modules/cjkcodecs/clinic/multibytecodec.c.h‎

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