Functional style
   -------------------------------------------------------
   @hosts        = C('db.hosts.sesssion');
   $hosts_ref    = C('db.hosts.sesssion');
   $host_2       = C('db.hosts.session.1');

   @cloned_hosts = My::Config::clone('db.hosts.session');    # deep clones the data
   $config       = My::Config::object;                       # returns the stored config object
   -------------------------------------------------------