async def METHOD_NAME(
    self,
    body: Body,
    mimetype: str,
    content_length: int | None,
    options: dict[str, str],
) -> tuple[MultiDict, MultiDict]:
    form = parse_qsl(
        (await body).decode(),
        keep_blank_values=True,
        encoding=self.charset,
        errors=self.errors,
    )
    return self.cls(form), self.cls()