\r
Try to log a user in.\r
\r
-C<$username> can be an ID or string (e.g. retrieved from a form) or an object.
+C<$username> can be a string (e.g. retrieved from a form) or an object.
If the object is a L<Catalyst::Plugin::Authentication::User> it will be used
as is. Otherwise C<< $c->get_user >> is used to retrieve it.\r
\r