def _stringify(self, transform: StringifyTransform) -> str:
    res = []
    if self.parameterPack:
        res.append('...')
    res.append(transform(self.identifier))
    return ''.join(res)
def _stringify(self, transform: StringifyTransform) -> str:
    res = []
    if self.parameterPack:
        res.append('...')
    res.append(transform(self.identifier))
    return .join(res)