tests

Make week number parsing conform to ISO8601 when Datetime::weekstart … #1

Job	Run time
tests (Alpine Edge, ubuntu-latest, alpine-edge)	4s
tests (Alpine Latest, ubuntu-latest, alpine-latest)	2s
tests (Archlinux Base, ubuntu-latest, archlinux)	2s
tests (Centos Stream9, ubuntu-latest, centos-stream9)	2s
tests (Debian Stable, ubuntu-latest, debianstable)	3s
tests (Fedora 37, ubuntu-latest, fedora37)	5s
tests (Fedora 38, ubuntu-latest, fedora38)	5s
tests (OpenSUSE Leap, ubuntu-latest, opensuseleap)	2s
tests (OpenSUSE Tumbleweed, ubuntu-latest, opensusetumbleweed)	3s
tests (Ubuntu 18.04, ubuntu-latest, ubuntu1804)	2s
tests (Ubuntu 20.04, ubuntu-latest, ubuntu2004)	3s
tests (Ubuntu 22.04, ubuntu-latest, ubuntu2204)	2s
tests (macOS 12, macos-12, osx-12)	3m 34s
tests (macOS 13, macos-13, osx-13)	3m 48s
tests (macOS 14, macos-14, osx-14)	1m 52s
	9m 49s

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