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I don't think the following first weeks are comparable by many work metrics:

* 30 December 2019 - 5 January 2020 (2020 W01)

* 4 January 2021 - 10 January 2021 (2021 W01)

I don't disagree with you. Some of the decisions that went into the ISO standard are real headscratchers for those of us who have been using North American week numbers

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