docs: def _fix_incoming(self, son, collection):
          """Apply manipulators to an incoming SON object before it gets stored.
  
          :Parameters:
            - `son`: the son object going into the database
            - `collection`: the collection the son object is being saved in
          """
          son = self._apply_incoming_manipulators(son, collection)
          son = self._apply_incoming_copying_manipulators(son, collection)
          return son