∀ {α : Type u} {β : α → Type v} {cmp : α → α → Ordering} [inst : Std.TransCmp cmp] (t t_1 : Std.ExtDTreeMap α β cmp),
  t = t_1 →
    ∀ (a a_1 : α),
      a = a_1 → ∀ (fallback fallback_1 : α), fallback = fallback_1 → t.getKeyD a fallback = t_1.getKeyD a_1 fallback_1