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try to be clearer about the use of the helper function

--HG--
branch : 3.0
6 jobs for topic/3.0/datetimedoc in 2 minutes and 46 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed test-coverage #168134

00:01:36

95.0%
passed test-pypy3 #168133

00:02:24

passed test-python36 #168129

00:01:07

passed test-python37 #168130

00:02:46

passed test-python38 #168131

00:00:36

passed test-python39 #168132

00:00:56