use strict; use warnings FATAL => 'all';
use Lowu;
my $first = [ qw/ a b c d e / ];
my $second = array( qw/ c d x y / );
my $third = [ qw/ a b c d e f g / ];
my $intersects = $first->intersection($second, $third);
ok $intersects->count == 2, '2 items in intersection'
or diag explain $intersects;
is_deeply
[ $intersects->sort->all ],
[ qw/ c d / ],
'boxed intersection looks ok'
or diag explain $intersects;
done_testing