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原实现先收集 lookupRelOffs 到中间数组,主循环再按下标回读。合并后直接在 主循环内读取偏移,省去中间数组分配与一次回读。FiraCode collectReachable -2.3%(0.116→0.113ms),reachable 集合 sha256 不变 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>