def _stringify(self, transform: StringifyTransform) -> str:
    if self.size:
        return (('[' + transform(self.size)) + ']')
    else:
        return '[]'
def _stringify(self, transform: StringifyTransform) -> str:
    if self.size:
        return (('[' + transform(self.size)) + ']')
    else:
        return '[]'