If you like this there has been a interesting discussion on the tzdb mailing list about how to handle the Vancouver change and the next releases of the tzdb and the Unicode Common Locale Data Repository: https://lists.iana.org/hyperkitty/list/tz@iana.org/thread/IE...

Interesting to see mention of how quickly this was implemented. It seemed sudden to me but I wasn’t sure if I was just out of the loop.