type DeepKeyAndValueTuple<TParent, T, TAcc, TAllKeys> = TAllKeys extends any ? DeepKeysAndValuesImpl<NonNullable<T[TAllKeys]>, TupleDeepKeyAndValue<TParent, T, TAllKeys>, 
  | TAcc
  | TupleDeepKeyAndValue<TParent, T, TAllKeys>> : never;