docs: async def _switch_dc(self, new_dc):
          """
          Permanently switches the current connection to the new data center.
          """
          self._log[__name__].info('Reconnecting to new data center %s', new_dc)
          dc = await self._get_dc(new_dc)
  
          self.session.set_dc(dc.id, dc.ip_address, dc.port)
          # auth_key's are associated with a server, which has now changed
          # so it's not valid anymore. Set to None to force recreating it.
          self._sender.auth_key.key = None
          self.session.auth_key = None
          self.session.save()
          await self._disconnect()
          return await self.connect()