By: Tom Sydney Kerckhove <syd@cs-syd.eu>
ical-recurrence: keep the week day of a numeric BYDAY GREEN for the test in the previous commit. 'FREQ=DAILY;BYDAY=2MO' now matches Mondays instead of every day. A numeric BYDAY at a frequency other than MONTHLY or YEARLY is forbidden, so it was dropped whole. Dropping it whole left the day filter empty, and an empty day filter is no restriction, so the recurrence set came out wider than the rule asked for rather than narrower. Keeping the week day and discarding only the number is what the unnumbered form already means, and is how 'byEveryWeekDayWeek' repairs the same shape. 'RecurrenceByDayNumeric' is still emitted, so a conforming run still refuses the rule and only a lenient run gets the repaired week day. 'Data.Maybe' goes with 'catMaybes': nothing in the module needs it now that no rule part is dropped.