a number without unit given as answer to a numerical question should not be recognized as correct, as long as unit are given in the answer fields

if one adds a a numerical question e.g
4 K + 4 K and fills the answer field according to the unit with K
moodle recognizes
9 K --> false
8 J --> false
8 K --> true
but 8 without the unit K is also recogized --> true

This behaviour should be improved, since in natural sciences units play an important role.