It would be nice if instead of the hyphen, students could enter the proper minus sign or one of those listed at
and they were still marked correct.
Whilst a lot of other computation systems don't recognize the proper sign U+2212 in text boxes (e.g. Excel, Windows calculator), the alternatives are more commonly recognized and entered in international keyboards. Some conversion to the hyphen for Numeric or Maple-graded questions, or a warning of invalid syntax, would be helpful.