docs: def set_objective_sense(self, sense):
          """Set type of problem (maximize or minimize)"""
          if sense == ObjectiveSense.Minimize:
              self._p.set_objective_sense(qsoptex.ObjectiveSense.MINIMIZE)
          elif sense == ObjectiveSense.Maximize:
              self._p.set_objective_sense(qsoptex.ObjectiveSense.MAXIMIZE)
          else:
              raise ValueError('Invalid objective sense')