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fairness_check F11: the October pin's embedded vector clean close is a known regression (#89) - #90

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fairness/f11-known-october
Oct 2, 2026
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fairness/f11-known-october

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@tae898 tae898 commented Oct 2, 2026

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Closes #89.

KNOWN_REGRESSIONS becomes a list per situation; vector gains the October pin's entry (BUGS F159 plus ArcadeData#8626, fixed by ArcadeData#8630 after the pin). On the merged October rows fairness_check now prints vector/lc10m as KNOWN and reports 0 failures, which unblocks the lifecycle landing (qOG).

πŸ€– Generated with Claude Code

https://claude.ai/code/session_01Lj5isEaoaGCeaZe5nNoWX4

…a known regression (#89)

KNOWN_REGRESSIONS becomes a list per situation, and vector gains the October
pin (417314c): only the embedded arm's clean close grows with what is
stored (5.4, 12.5, 88, and 1,400 ms at 10k to 10M; the server's stays near
5 ms), because the lane reads the index statistics before close (BUGS F159,
disclosed on the page as an upper bound) and at this pin a clean close fsyncs
every data file it holds (ArcadeData#8626, fixed by ArcadeData#8630 after the
pin). On the merged October rows the gate now prints vector/lc10m as KNOWN
and reports 0 failures. The entry comes out at the re-pin.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Lj5isEaoaGCeaZe5nNoWX4
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tae898 merged commit 04eb583 into main Oct 2, 2026
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tae898 deleted the fairness/f11-known-october branch October 2, 2026 13:41
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fairness_check F11: the October pin's embedded vector clean close (BUGS F159, #8626) is a known regression, not a gate failure

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