∀ {α : Type u} [inst : BEq α] [inst_1 : Hashable α] {β : Type v} (m : Std.DHashMap.Internal.Raw₀ α fun x => β)
  [EquivBEq α] [LawfulHashable α], (↑m).WF → (Std.DHashMap.Raw.Const.toList ↑m).length = (↑m).size