118
If the user is not root, and the user ID is equal to the
119
group ID, and the username is the same as primary group name,
120
the umask group bits are set to be the same as
121
owner bits (examples: 022 -> 002, 077 -> 007).
118
If the user is not root and the username is the same as
119
primary group name, the umask group bits are set to be the
120
same as owner bits (examples: 022 -> 002, 077 -> 007).