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