processResult = (isReject, value) => {
        // Serialize the result.
        let serial;
        try {
          serial = serialize(harden(value));
        } catch (error) {
          // Promote serialization errors to rejections.
          isReject = true;
          serial = serialize(harden(error));
        }

        send({
          type: 'CTP_RETURN',
          epoch,
          answerID: questionID,
          [isReject ? 'exception' : 'result']: serial,
        });
      }
@type {(isReject: boolean, value: any) => void}