Fix arg parsing again. Sigh.

7 jobs for v1.6.3 in 3 minutes and 42 seconds (queued for 3 seconds)
latest
Status Name Job ID Coverage
  Test
passed test:2.7 #15420

00:00:29

97.0%
passed test:3.3 #15421

00:00:30

97.0%
passed test:3.4 #15422

00:00:30

97.0%
passed test:3.5 #15423

00:00:31

97.0%
passed test:3.6 #15424

00:00:31

97.0%
passed test:pypy-2 #15425

00:00:33

97.0%
passed test:pypy-3 #15426

00:00:35