∀ {α : Type u_1} [inst : BEq α] [inst_1 : Hashable α] {β : Type u_2} [EquivBEq α] [LawfulHashable α]
  (m : Std.DHashMap.Internal.Raw₀ α fun x => β),
  (↑m).WF →
    ∀ {k : α} {f : β → β} {hc : (Std.DHashMap.Internal.Raw₀.Const.modify m k f).contains k = true}, m.contains k = true