∀ {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] [inst_4 : Inhabited β],
  (↑m).WF → ∀ {a : α}, (↑m).isEmpty = true → Std.DHashMap.Internal.Raw₀.Const.get! m a = default