∀ {α : Type u} {β : Type v} {m : Std.HashMap.Raw α β} [inst : BEq α] [inst_1 : Hashable α] [EquivBEq α]
  [LawfulHashable α],
  m.WF →
    ∀ {k k' : α} {v : β},
      List.find? (fun a => a.1 == k) m.toList = some (k', v) ↔ m.getKey? k = some k' ∧ m[k]? = some v