Developer credits
Git commits in Moodle 3.9.6 by Brendan Heywood
commit 23cc13e8ef2b9123f5320b223fcde71a9a4643b4 Author: Brendan Heywood <brendan@catalyst-au.net> Date: Wed, 17 Mar 2021 14:37:29 +0800 Tag: v3.9.6 MDL-71068 login: Fix edge cases with $CFG->protectusernames