Do you mean that an implementation is allowed to return an exotic object from the Error constructor?
https://tc39.github.io/ecma262/#sec-error-message The Error constructor calls OrdinaryCreateFromConstructor in step 2. https://tc39.github.io/ecma262/#sec-ordinarycreatefromconstructor According to its definition, OrdinaryCreateFromConstructor creates an ordinary object. Not returning an ordinary object from the Error constructor is non-conformant and, assuming that conformance is a requirement for V8, it's a bug. Just because an implementation adds a non-standard property to an ordinary object, even if its value is an exotic object, it doesn't turn the ordinary object into an exotic object.
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