Fix arg parsing again. Sigh.

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

00:00:29

97.0%
passed #15421
test:3.3

00:00:30

97.0%
passed #15422
test:3.4

00:00:30

97.0%
passed #15423
test:3.5

00:00:31

97.0%
passed #15424
test:3.6

00:00:31

97.0%
passed #15425
test:pypy-2

00:00:33

97.0%
passed #15426
test:pypy-3

00:00:35