∀ {α : Type u} {β : Type v} [inst : Ord α] {t : Std.DTreeMap.Internal.Impl α fun x => β} {k : α}
  [inst_1 : Inhabited (α × β)],
  Std.DTreeMap.Internal.Impl.Const.getEntryLT! k t = (Std.DTreeMap.Internal.Impl.Const.getEntryLT? k t).get!