docs: def from_optional_dicts(cls, ds: Optional[List[dict]],
                              force_snake_case: bool=True, force_cast: bool=False, restrict: bool=True) -> TOption[TList[T]]:
          """From list of dict to optional list of instance.
  
          :param ds: List of dict
          :param force_snake_case: Keys are transformed to snake case in order to compliant PEP8 if True
          :param force_cast: Cast forcibly if True
          :param restrict: Prohibit extra parameters if True
          :return: List of instance
  
          Usage:
  
              >>> from owlmixin.samples import Human
              >>> Human.from_optional_dicts(None).is_none()
              True
              >>> Human.from_optional_dicts([]).get()
              []
          """
          return TOption(cls.from_dicts(ds,
                                        force_snake_case=force_snake_case,
                                        force_cast=force_cast,
                                        restrict=restrict) if ds is not None else None)