has   'friends' => ( is => 'rw',   isa => 'Array',   default => () );
has    friends  => ((is => 'rw'), (isa => 'Array'), (default => ()));
has    friends  =>   is => 'rw',   isa => 'Array',   default => ();
has    friends  =>   is =>  rw =>  isa =>  Array =>  default => ();
has   "friends",    "is",  "rw",  "isa",  "Array",  "default",  ();
has qw/friends       is     rw     isa     Array     default/,  ();