publishNameAddition = (id, petName) => {
      const idRecord = parseId(id);
      nameChangesTopic.publisher.next({ add: petName, value: idRecord });
      publishIdChangeToSubscribers(id, { add: idRecord, names: [petName] });
    }
@param {string} id - The id receiving a name new name.
@param {string} petName - The new name.