docs: def set_null_values_in_dict(d: Dict[str, Any],
                              null_literals: List[Any]) -> None:
      """
      Within ``d`` (in place), replace any values found in ``null_literals`` with
      ``None``.
      """
      if not null_literals:
          return
      # DO NOT add/delete values to/from a dictionary during iteration, but it
      # is OK to modify existing keys:
      #       https://stackoverflow.com/questions/6777485
      #       https://stackoverflow.com/questions/2315520
      #       https://docs.python.org/3/library/stdtypes.html#dict-views
      for k, v in d.items():
          if v in null_literals:
              d[k] = None