- bugfix: use float datatype to calculate factorials
- bugfix: allow ° symbol as a unit
- improvement: allow <> as alternative to !=
- internal: assure full compatibility with Moodle 5.1
Note: The plugin now allows to calculate factorials larger than 20! in the same way as older (5.x) versions. However, due to limited precision, the result for factorials larger than 27! will generally not be accurate -- in the same way as in older versions.