docs: public static void cloneInternal ( Kerb5Authenticator to, Kerb5Authenticator from ) {
          NtlmPasswordAuthenticator.cloneInternal(to, from);
          to.setUser(from.getUser());
          to.setRealm(from.getRealm());
          to.setService(from.getService());
          to.setLifeTime(from.getLifeTime());
          to.setUserLifeTime(from.getUserLifeTime());
  
          to.canFallback = from.canFallback;
          to.forceFallback = from.forceFallback;
      }