Possible documentation error
Summary
At https://docs.gitlab.com/ee/user/permissions.html#permissions, it says
"If a user is both in a group's project and the project itself, the highest permission level is used."
Expected behavior
"If a user is both in a group's project and the group itself, the highest permission level is used."
(at least that makes more sense to me, as the structure seems to be Group -> multiple projects, didn't have the chance to explore much yet :) )