URL: https://github.com/SSSD/sssd/pull/5784
Title: #5784: proxy: allow removing group members

alexey-tikhonov commented:
"""
> Given that the `id` command will do lookups by GID an `id` lookup for the 
> user from the second domain which is a member of the group with the 
> duplicated GID will return the wrong group name. In this sense I would say we 
> do not support this kind of configuration.
> 
> Additionally, the filesystem is doing access control based with respect to 
> groups with the help of the GID using the same GID in different domains might 
> give users access to files of users from the other domain, which is typically 
> not expected.

I read this as GIDs collisions aren't supported (i.e. GIDs are unique) and 
hence we can compare GIDs.
"""

See the full comment at 
https://github.com/SSSD/sssd/pull/5784#issuecomment-934497065
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