code: public static <K, V> CaffeineConfiguration<K, V> defaults(Config config) {
      return new Configurator<K, V>(config, "default").configure();
    }
docs: Retrieves the default cache settings from the configuration resource.
  
  @param config the configuration resource
  @param <K> the type of keys maintained the cache
  @param <V> the type of cached values
  @return the default configuration for a cache