docs: def get_effective_perm_list(self, subj_str):
          """
      Args:
        subj_str : str
          Subject for which to retrieve the effective permissions.
  
      Returns:
        list of str: List of permissions up to and including the highest permission for
        subject, ordered lower to higher, or empty list if subject does not have any
        permissions.
  
        E.g.: If 'write' is highest permission for subject, return ['read', 'write'].
      """
          highest_perm_str = self.get_highest_perm_str(subj_str)
          if highest_perm_str is None:
              return []
          return self._equal_or_lower_perm_list(highest_perm_str)