docs: def ilist(self, in_list=[]):
          """Return a list that uses this server's IRC casemapping.
  
          All strings in this list are lowercased using the server's casemapping before inserting
          them into the list, and the ``in`` operator takes casemapping into account.
          """
          new_list = IList(in_list)
          new_list.set_std(self.features.get('casemapping'))
          if not self._casemap_set:
              self._imaps.append(new_list)
          return new_list