[ale] Sudoers, groups, default group

[Jim Kinney]

If a user has a default group that's not a typical user private group (same
name, no members except that user), and sudoers has a group entry of that
default group, does sudo get it's group membership of that user from a user
lookup or a group lookup?

Got a user with default group foo but the user doesn't show as a member
using getent group foo. The user can use the group sudo process. Seems
wrong to me. Maybe user not required to be a member of their default group?
Seems REALLY wrong to me.
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