Partial marks settings: you can't set a whole number of partial marks for fractions that aren't whole percentages

The motivating example is a number entry part worth 3 marks, where you want to award 2 marks for a correct answer with the wrong precision.
You can't set the range input for the partial marks to (2/3 * 100)%.

The input could be a text field instead, and take a JME expression. Or the range could be set in terms of the maximum available for the part, with increments of something like 0.1 marks.

Start by locating the partial-marks range input in the editor and reproduce the 3-mark example where awarding 2 marks requires 66⅔%. Review the two suggested approaches—an expression-capable text field or a range based on maximum marks—and treat the work as done when the editor supports setting that value accurately.

Written by the indexing model from the issue text.