∀ {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 → ∀ {k : α} {fallback : β}, Std.DHashMap.Internal.Raw₀.Const.getD (m.erase k) k fallback = fallback