Developer credits
Git commits in Moodle 3.11.x by Shintaro Fujiwara
commit e271fd3a796dba2bbd206a3682a41e9c260bf023 Author: Shintaro Fujiwara <shintaro.fujiwara@gmail.com> Date: Fri, 26 Mar 2021 09:35:51 +0800 Tag: v3.11.0-beta MDL-69304 gradeimport_csv: Validate if the user id is numerical.