code: def update(self, other):
          
  
          acceptable_models = [ m for m in other._models if set(m.model.keys()) == self.variables ]
          self._models.update(acceptable_models)
          self._eval_exhausted.update(other._eval_exhausted)
          self._max_exhausted.update(other._max_exhausted)
          self._min_exhausted.update(other._min_exhausted)
docs: Updates this cache mixin with results discovered by the other split off one.