[LucaCappelletti94]

LAContext construction and most of its methods take an ID from two process-wide counters that Apple increments with a plain load, add, and store, no lock or atomic instruction. Two threads that each create and use only their own context can still race on those counters and end up sharing an instance ID. Filed with Apple as FB25157108, and discussed on madsmtm/objc2#864.

Two independently captured runs are included, one on the bare host and one inside a VM, both landing on the same macOS build, so the result does not rest on a single run's luck. A monthly workflow reruns it against the three macOS majors still receiving Apple's security patches and records a fresh result if anything changes.

[coderabbitai]

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