code: func (f *Field) Row(rowID uint64) (*Row, error) {
  	if f.Type() != FieldTypeSet {
  		return nil, errors.Errorf("row method unsupported for field type: %s", f.Type())
  	}
  	view := f.view(viewStandard)
  	if view == nil {
  		return nil, ErrInvalidView
  	}
  	return view.row(rowID), nil
  }
docs: // Row returns a row of the standard view.
  // It seems this method is only being used by the test
  // package, and the fact that it's only allowed on
  // `set` fields is odd. This may be considered for
  // deprecation in a future version.