rules, but not vice versa.
Note that this relaxed mode does not refuse a couple of very questionable
-syntaxes. For example it permits a leading or embedded period. A leading period
+syntaxes. For example, it permits a leading or embedded period. A leading period
is problematic because the matching home directory would typically be hidden
from the user's/administrator's view. An embedded period is problematic since
it creates ambiguity in traditional `chown` syntax (which is still accepted