http2: optimize neverIndex lookup with SafeSet #61223
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Replace array-based neverIndex lookup with SafeSet for O(1) lookup performance. This improves buildNgHeaderString performance from O(n) to O(1) per header, providing significant speedup in hot path scenarios with many headers.
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Optimizes
neverIndexlookup by replacingArray.includes()withSafeSet.has()for O(1) lookup performance.forloop instead of.map(): Direct Set construction avoids intermediate array allocation