docs: public CacheConfigurationBuilder<K, V> withExpiry(ExpiryPolicy<? super K, ? super V> expiry) {
      if (expiry == null) {
        throw new NullPointerException("Null expiry");
      }
      CacheConfigurationBuilder<K, V> otherBuilder = new CacheConfigurationBuilder<>(this);
      otherBuilder.expiry = expiry;
      return otherBuilder;
    }