valueOf() {
        // Throwing here is the behavior of ECMAScript "Temporal" date/time API.
        // See https://tc39.es/proposal-temporal/docs/plaindate.html#valueOf
        throw new TypeError('prod message');
      }
The following Node.normalize() tests are intentionally failing.
See https://github.com/facebook/react/issues/9836 tracking whether we'll need to fix this or if it's unnecessary.