code: def _wrap_users(users, request):
      
      result = set()
      for u in users:
          if u is SELF and is_authenticated(request):
              result.add(request.user.get_username())
          else:
              result.add(u)
      return result
docs: Returns a list with the given list of users and/or the currently logged in user, if the list
      contains the magic item SELF.