use Set::Scalar;
use Set::Scalar::Valued;

$foo = Set::Scalar::Valued->new;
$foo->insert("bar", Set::Scalar->new);
$foo->value("bar")->insert("baz");

# But I get 'Can't call method 'insert' on unblessed
# reference at test.pl line 6.' What's the deal oh wise
# ones?