Tramp advises vc-user-login-name, how to remove?

[Kai Großjohann]

In some cases, VC uses file-attributes to obain the uid of a file,
then uses vc-user-login-name to obtain the login name of that uid.

In these cases, VC could call file-attributes with the new optional
arg ID-FORMAT equal to `string', instead.

In one case, VC uses vc-user-login-name to obtain the login name of
the currently logged in user.  This is in
vc-default-update-changelog.  Would it work to just call
user-login-name instead?

It seems the call in vc-rcs-state-heuristic could also use the new
ID-FORMAT arg of file-attributes.  Right?

Could vc-rcs-fetch-master-state use user-login-name?  What is the
intent of that comparison?

Could vc-rcs-consult-headers use user-login-name?  What is the intent
of that comparison?

Could the call in vc-sccs-state-heuristic use the new ID-FORMAT arg?

What should vc-sccs-state do?

Thanks,
Kai