private async Task SubscribeReturn(PersistentSubscription ps, ResolvedEvent vnt, int?value, CancellationToken ct)
        {
            var json   = Encoding.UTF8.GetString(vnt.Event.Data.Span);
            var result = JsonSerializer.Deserialize <TestEvent>(json);

            _ = result.ImportantData;

            await ps.Ack(new[] { vnt.Event.EventId });
        }