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Measured on Node 24. 20,000 lookups against a 5,000 item array: list.includes(p) - 368.9 ms new Set then s.has(p) - 2.09 ms Across 3 runs: 256x, 235x, 256x. Median 256x. Why: includes walks the array from index zero every single time, so cost is lookups times array length. A Set hashes the value and jumps straight to the slot, roughly constant ...
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