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Clang-20 detects a data race between the unlock and the non-atomic read of the lock state. Use a relaxed load for the assertion to avoid the race.
Tests in this directory are compiled into the _testinternalcapi extension. The main file for the extension is Modules/_testinternalcapimodule.c, which calls `_PyTestInternalCapi_Init_*` from these functions. See Modules/_testcapi/README.txt for guideline when writing C test code.