ArrIntNsFlatBuilder
trait ArrIntNsFlatBuilder[B <: ElemIntN, ArrB <: ArrIntNs[B]] extends ArrValueNsFlatBuilder[B, ArrB]
Trait for creating the ArrTFlatBuilder type class instances for ArrIntNs final classes. Instances for [[ArrFlatBuilder] should go in the
companion object the ArrT final class. The first type parameter is called B, because to corresponds to the B in
map(f: A => B): ArrB function.