I check the v4.1 manpage: "Ranges or lists of names are not allowed."

And the crontab entry parsing source sports a familiar phrase:

/ no numbers, look for a string if we have any /

So vixie-cron v4.1 seems to support named weekday & month ranges & lists, same as cronie.

But then I vaguely seemed to remember seeing Paul Vixie's name on #techtwitter somewhere... and sure enough: @paulvixie
.

So... let's DM him. (Why not? Maybe he's as bored as I am.)