The first time subtraction occurs on [L439](https://github.com/metrics-rs/metrics/blob/metrics-exporter-tcp-v0.11.1/metrics-exporter-tcp/src/lib.rs#L439) or on [L461](https://github.com/metrics-rs/metrics/blob/metrics-exporter-tcp-v0.11.1/metrics-exporter-tcp/src/lib.rs#L461). The second time (and correct) subtraction occurs on [L474](https://github.com/metrics-rs/metrics/blob/metrics-exporter-tcp-v0.11.1/metrics-exporter-tcp/src/lib.rs#L474). As a result, the [client_count](https://github.com/metrics-rs/metrics/blob/metrics-exporter-tcp-v0.11.1/metrics-exporter-tcp/src/lib.rs#L142) wraps around.