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The test expected a store exclusive to fail after another thread changed the value with exclusive pairs and changed it back (ABA), as the console's monitor would. runtime/cpu.h's monitor (EXCL ldxN/stxN, ldxp128/stxp128) compares the memory with the value loaded, so a value restored to the same bits passes by design, and the test has failed since both came in with the base import. It now checks both cases the helpers define: one change fails the store (status 1), a change and its undoing does not (status 0), for the 32-bit, 64-bit and 128-bit forms, with the control and the contention runs as before. Its docstring, a comment and docs/building.md's row say that the monitor does not see the change-and-restore case. No runtime change. The test passes under .venv: the one-change cases fail the store, the two-change cases succeed, and every contention counter is exact. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>