private static void WriteCheckGroupExistenceWithAckMessage(ref MessagePackWriter writer, CheckGroupExistenceWithAckMessage message)
{
writer.WriteArrayHeader(4);
writer.Write(ServiceProtocolConstants.CheckGroupExistenceWithAckMessageType);
writer.Write(message.GroupName);
writer.Write(message.AckId);
message.WriteExtensionMembers(ref writer);
}
