In your documentation you state that this plugin uses alphanumeric, but it seems to use natural sort order. That is that x7, x8 and x70, is sorted according to the number sequence of 7, 8, 70, and not ...

It is implementation of Comparator<String> Java interface that allows the alphanumeric sort. Alphanumeric sort is a way of sorting data or information based on alphanumeric characters, which includes ...