Monadic Zero
Do U remember second state of Response - Marvelous?
If we represent Marvelous via Answer with null inside - it's not enough, than we can translate Marvelous into Answer - ignoring it's Essentials - that is error:
val box = new Answer[Any](null)
val func:(Any)=>Int = (in) => 5
val res = box map func // Produces Answer(5)
Expected behavior, that is described via The First Zero Law: Identity
mzero map/flatMap f = mzero
