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Was hardcoded to "[object Object]" for everything; per ES it should return "[object Array]", "[object Function]", "[object Number]", etc. by class. Added js-object-tostring-class helper that switches on type-of and dict-internal markers (__js_*_value__, __callable__). Prototype-identity checks ensure Object.prototype.toString.call(Number.prototype) returns "[object Number]" (similar for String/Boolean/Array). built-ins/Array: 18/45 → 20/45, built-ins/Number: 43/50 → 44/50. conformance.sh: 148/148.