Then what is the use of reversed property in tooltip?
The shared property does not provide list of all overlapped values, but it also includes all other values sharing the common x-axis. So if at x=2, there are 5 datapoints 2 at y=4 and 3 at y=7 and the mouse pointer is at y=7, how can it be known with the shared property that at which datapoint the mouse is because the shared property will return all 5 datapoints.