Developer credits
Git commits in Moodle 3.5.6 by Leon Stringer
commit f9ea236c4ff55b18ea80eee8c479a03fadb6cf65 Author: Leon Stringer <leon@priorsvle.com> Date: Fri, 29 Mar 2019 23:56:18 +0800 Tag: v3.5.6 MDL-64719 cache: Implement purge_current_user() in \cache