docs: def no_overlap(multienum):
      """Class decorator for MultiValueEnum ensuring non overlapping elements
      in member values. Other words: ensure no element in any member value is
      present in any other member value.
      """
      duplicates = []
      members = []
  
      for member in multienum.__members__.values():
          for prev_member in members:
              intersection = set(member._value_) & set(prev_member._value_)
              if intersection:
                  duplicates.append((member._name_, prev_member._name_, intersection))
          members.append(member)
  
      if duplicates:
          alias_details = ', '.join(["{} & {} -> {}".format(alias, name, intersection)
                                    for (alias, name, intersection) in duplicates])
          raise ValueError('common element found in {!r}: {}'
                           .format(multienum, alias_details))
      return multienum