pugs> my @array does role {
....> multi method insert ($x) { @.push($x) unless any(self) eqv $x }
....> multi method insert (@x) { @.insert($_) for @x }
....> } = 1..5;
pugs> @array.insert($_) for 2..6;
pugs> say @array
123456
Bool::True
pugs> @array.insert(3..7);
pugs> say @array
12345634567
Bool::True