∀ {α : Sort u_1} {β : Sort u_2} [inst : SizeOf α] [inst_1 : SizeOf β] (toFun : α → β) (invFun : β → α)
  (left_inv : autoParam (Function.LeftInverse invFun toFun) Equiv.left_inv._autoParam)
  (right_inv : autoParam (Function.RightInverse invFun toFun) Equiv.right_inv._autoParam),
  sizeOf { toFun := toFun, invFun := invFun, left_inv := left_inv, right_inv := right_inv } = 1