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These tests add coverage for a corner case in the TZDB. In spring 1919, the America/Toronto time zone switched to DST at 23:30 on March 30th, skipping an hour ahead to 00:30 on March 31st. This meant that both March 30th and March 31st were 23.5-hour days. See: https://github.com/tc39/proposal-temporal/issues/2910