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Per ECMA, String(obj) should throw TypeError when both obj.toString() and obj.valueOf() return objects. Was returning "[object Object]" instead, silently swallowing the spec violation. Replaced the inner fallback with (raise (js-new-call TypeError ...)). Preserves the outer "[object Object]" for the case where there's no toString lambda. Fixes S8.12.8_A1. built-ins/String: 75/99 → 77/99 (canonical, best run). conformance.sh: 148/148.