docs: def get(self, key: K) -> TOption[T]:
          """
          :param key:
  
          Usage:
  
              >>> TDict(k1=1, k2=2, k3=3).get("k2")
              Option --> 2
              >>> TDict(k1=1, k2=2, k3=3).get("unknown")
              Option --> None
          """
          return TOption(self[key]) if key in self else TOption(None)