Project: moodle
Issue MDL-30668: Prevent the grader report from storing serialized data in the user_preferences table
See MDL-20245. When categories are collapsed on the grader report it appears than an array is serialized and stored in the user_preferences table. This table is really for simple name value pairs. It would be good if we could avoid storing serialized data and instead only stored human readable data.
Story points: 20