    # File lib/merb-core/dispatch/session.rb, line 212
          def session=(new_session)
            if self.session?(new_session.class.session_store_type)
              original_session_id = self.session(new_session.class.session_store_type).session_id
              if new_session.session_id != original_session_id
                set_session_id_cookie(new_session.session_id)
              end
            end
            session_stores[new_session.class.session_store_type] = new_session
          end