code: def _cleanup_closed(self) -> None:
          
          if self._cleanup_closed_handle:
              self._cleanup_closed_handle.cancel()
  
          for transport in self._cleanup_closed_transports:
              if transport is not None:
                  transport.abort()
  
          self._cleanup_closed_transports = []
  
          if not self._cleanup_closed_disabled:
              self._cleanup_closed_handle = helpers.weakref_handle(
                  self, '_cleanup_closed',
                  self._cleanup_closed_period, self._loop)
docs: Double confirmation for transport close.
          Some broken ssl servers may leave socket open without proper close.