public static void UseImmutableFormatters(this SerializerConfig config)
 {
     ImmutableCollectionFormatterResolver.ApplyToConfig(config);
 }
        public static void ApplyToConfig(SerializerConfig config)
        {
            var immutableResolver = new ImmutableCollectionFormatterResolver();

            config.OnResolveFormatter.Add((c, t) => immutableResolver.GetFormatter(t));
        }