∀ {α : Type u_6} {β : Type u_7} [inst : Max α] [inst_1 : Max β] [inst_2 : SizeOf α] [inst_3 : SizeOf β] (toFun : α → β)
  (map_sup' : ∀ (a b : α), toFun (a ⊔ b) = toFun a ⊔ toFun b), sizeOf { toFun := toFun, map_sup' := map_sup' } = 1