This is very likely caused by something janky my ISP (AT&T) is doing with IPv6, but the above named test fails for me because IPv6 addresses like `::1q` do not fail to resolve as the test expects.

I'm not sure what can or should be done about it, but as this is an annoying local failure, and I couldn't find another mention of it by searching bpo, I wanted to at least get it on record.

The test function's comment says:

"
        # These are all malformed IP addresses and expected not to resolve to
        # any result.  But some ISPs, e.g. AWS, may successfully resolve these
        # IPs.
"

So apparently, put AT&T in that bucket of ISPs that resolve those IPv6 addresses.