docs: def check_key(self, key, raise_error=True, *args, **kwargs):
          """
          Checks whether the key is a valid formatoption
  
          Parameters
          ----------
          %(check_key.parameters.no_possible_keys|name)s
  
          Returns
          -------
          %(check_key.returns)s
  
          Raises
          ------
          %(check_key.raises)s"""
          return check_key(
              key, possible_keys=list(self), raise_error=raise_error,
              name='formatoption keyword', *args, **kwargs)