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js-list-set! was a no-op for the length key. Added a clause that pads with js-undefined via js-pad-list! when target > current. Truncation skipped: the pop-last! SX primitive doesn't actually mutate the list (length unchanged after the call), so no clean way to shrink in place from SX. Extension covers common cases. built-ins/Array: 16/45 → 17/45. conformance.sh: 148/148.