public IDisposable ListenUpdates(Action <T> callback)
{
if (upVal == null)
{
upVal = new EventStream <T>();
}
return(upVal.Subscribe(callback));
}
public IDisposable ListenUpdates(Action <TVal> reaction)
{
return(changed.Subscribe(reaction));
}
public IDisposable Subscribe(Action <T> action) => receiving.Subscribe(action);
