- updated to 3.0300
- Now mean() and median() and other routines return undef() if there are
no data.
- Somewhat incompatible change: some methods that returned undef() under
list context now return an empty list (so it will be false).
- it is generally not recommended to call such methods in list context
as they should always be called in scalar context.
- Resolves https://rt.cpan.org/Ticket/Display.html?id=74693
- thanks to Shawn Laffan for the report and the patch.
- Fix https://rt.cpan.org/Ticket/Display.html?id=72495 .
- percentile should not die and should return undef if there are
no elements in the collection.