public override void WriteJson(JsonWriter writer, BigInteger?value, Newtonsoft.Json.JsonSerializer serializer)
        {
            if (!value.HasValue)
            {
                writer.WriteNull();
                return;
            }

            _bigIntegerConverter.WriteJson(writer, value.Value, serializer);
        }
 public override void WriteJson(JsonWriter writer, BigInteger?value, JsonSerializer serializer)
 {
     _bigIntegerConverter.WriteJson(writer, value.Value, serializer);
 }