Developer credits
Git commits in Moodle 2.8.x by Pavel Sokolov
commit 5ae56c6e44436d6fe42d2e3eba354d1c5c9e564d Author: Pavel Sokolov <pavel.m.sokolov@gmail.com> Date: Wed, 24 Sep 2014 15:51:03 +0800 Tag: v2.8.0-beta MDL-37707 mod_assign: Prevent user from switching to and from team submissions