code: def s(self, *args, **kwargs) -> Partial[Stepwise]:
          
          return Partial(Stepwise, self.base, *self.rules, *args, **kwargs)
docs: Create an unbound prototype of this class, partially applying arguments
  
          .. code:: python
  
              @stepwise
              def control(pool: Pool, interval):
                  return 10
  
              pipeline = control.s(interval=20) >> pool
  
          :note: The partial rules are sealed, and :py:meth:`~.UnboundStepwise.add`
                 cannot be called on it.