Developer credits
Git commits in Moodle 3.9.7 by Shintaro Fujiwara
commit aa6c15c97544f92a673aff005d172ba154ee8125 Author: Shintaro Fujiwara <shintaro.fujiwara@gmail.com> Date: Fri, 26 Mar 2021 03:26:51 +0800 Tag: v3.9.7 MDL-69304 gradeimport_csv: Validate if the user id is numerical.