docs: def from_json_dict(cls,
                         json_dict  # type: Dict[str, Any]
      ):
          # type: (...) -> DateSpec
          """ Make a DateSpec object from a dictionary containing its
              properties.
  
              :param dict json_dict: This dictionary must contain a
                  `'format'` key. In addition, it must contain a
                  `'hashing'` key, whose contents are passed to
                  :class:`FieldHashingProperties`.
  
              :param json_dict: The properties dictionary.
          """
          # noinspection PyCompatibility
          result = cast(DateSpec,  # For Mypy.
                        super().from_json_dict(json_dict))
  
          format_ = json_dict['format']
          result.format = format_['format']
  
          return result