Deliberately breaking the queue to prove the test setup works is the part of this I keep coming back to. Swapping one release for relaxed and watching every assertion still pass while only ThreadSanitizer catches it is a much stronger argument for the tooling than any passing test suite could be — it shows the tests can actually detect the failure mode they exist for. The third-reader depth bug was the other detail that stood out: reading tail then head and getting a subtraction that wraps to nearly 2^64 is exactly the kind of bug that only shows up when a third thread observes two moving indices, and the head-first ordering plus clamping is a clean fix. Same with the hanging test — a consumer assertion failure leaving the producer spinning forever is a failure mode that is easy to miss until it happens in CI. And I appreciate the honesty at the end about claiming correctness, not speed: holding the throughput question open rather than implying the lock-free design is already faster makes the whole series easier to trust.