docs: def map_values2(self, func):
          """
          :param func:
          :type func: (K, T) -> U
          :rtype: TDict[U]
  
          Usage:
  
              >>> TDict(k1=1, k2=2, k3=3).map_values2(lambda k, v: f'{k} -> {v*2}') == {
              ...     "k1": "k1 -> 2",
              ...     "k2": "k2 -> 4",
              ...     "k3": "k3 -> 6"
              ... }
              True
          """
          return TDict({k: func(k, v) for k, v in self.items()})