91e7c90329
Through various refactorings over time, the extract(timezone_minute from time with time zone) and extract(timezone_minute from timestamp with time zone) implementations ended up with two different but equally nonsensical formulas by using SECS_PER_MINUTE and MINS_PER_HOUR interchangeably. Since those two are of course both the same number, the formulas do work, but for readability, fix them to be semantically correct.
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