Dear all,
Today I've tagged and released a new version of STACK, I hope in time for the start of the next teaching cycle.
https://moodle.org/plugins/pluginversion.php?id=12054
This is an incremental release, but with some significantly improved features for dealing with scientific units.
https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/Developer/Development_history.md
Comments and suggestions for future versions are very welcome.
Chris