I added also a rejection of '\r' and '\x00':
https://github.com/spaceone/cpython/commit/41d6e278e4ffa95577d843e0d50d4c43b5ac46ef

It's only my opinion but I would prefer to reject all of these non printable characters:
'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f[]\x7f'

But as the _parse currently detects them as valid and your opinion is probably a very different one I will not add these characters.