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String([1,2,3]) was returning "(1 2 3)" (the SX (str v) fallback in js-to-string fell through for SX lists). Replaced the fallback with a list-typed branch that delegates to (js-list-join v ","). Fixes String(arr), "" + arr, and any implicit array-to-string coercion. built-ins/String: 65/99 → 67/99. conformance.sh: 148/148.