∀ {m : Type u_1 → Type u_2} {α₁ β α₂ : Type u_1} [inst : Monad m] [inst_1 : LawfulMonad m]
  [inst_2 : Std.Iterator α₁ m β] [inst_3 : Std.Iterator α₂ m β] [Std.Iterators.Finite α₁ m] [Std.Iterators.Finite α₂ m]
  {ita : Std.IterM m β} {itb : Std.IterM m β}, ita.Equiv itb → ita.toListRev = itb.toListRev