∀ {α : Type u} {β : α → Type v} {cmp : α → α → Ordering} {t₁ t₂ : Std.DTreeMap.Raw α β cmp} [Std.TransCmp cmp]
  [inst : Inhabited ((a : α) × β a)], t₁.WF → t₂.WF → t₁.Equiv t₂ → t₁.minEntry! = t₂.minEntry!