docs: def _fnop_style(schema, op, name):
          """Set an operator's parameter representing the style of this schema."""
          if is_common(schema):
              if name in op.params:
                  del op.params[name]
              return
          if _is_pending(schema):
              ntp = 'pending'
          elif schema.style is tuple:
              ntp = 'tuple'
          elif schema.style is _spl_dict:
              ntp = 'dict'
          elif _is_namedtuple(schema.style) and hasattr(schema.style, '_splpy_namedtuple'):
              ntp = 'namedtuple:' + schema.style._splpy_namedtuple
          else:
              return
          op.params[name] = ntp