Tries system full names and git configuration as well.
fullname(fallback = NULL)
If not NULL then this value is returned if the full name of the user cannot be found, instead of triggering an error.
NULL
The full name of the current user.
Other user.names: email_address; gh_username; username; whoami
email_address
gh_username
username
whoami
# NOT RUN { fullname() # }
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