docs: def _standard_items(self, restrictions):
          """Generate argument pairs for queries like where(id=2)"""
          standard_items = self._build_where(restrictions, for_in=False)
          names = ["{}.{} == ?".format(pair[0], pair[1])
                   for pair in standard_items]
          values = [item[2] for item in standard_items]
          return (names, values)