∀ {α : Type u} {β : α → Type v} [inst : BEq α] [inst_1 : Hashable α] [inst_2 : LawfulBEq α]
  (m : Std.DHashMap.Internal.Raw₀ α β),
  Std.DHashMap.Internal.Raw.WFImp ↑m →
    ∀ (a : α) (f : Option (β a) → Option (β a)), Std.DHashMap.Internal.IsHashSelf (↑(m.alterₘ a f)).buckets