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The macOS runners kept pull requests waiting in the queue, and nothing in the module depends on the operating system. What the macOS jobs gave was arm64: the reads that take no lock depend on the order in which memory is written, which arm64 keeps less of than x86-64, and the compiler inlines differently there. GitHub's Linux arm64 runners, free for public repositories, keep that. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Under the race detector and with coverage, s3fifo takes about four minutes of the five on a typical runner, and on a slow one, 1.7 times as slow across every package, it ran out of time in pull request 6. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Replaces
macos-latestwithubuntu-24.04-armin the test matrix.macOS itself is still covered by local development on Apple Silicon.
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