Mutable Data Classes #5811

Job	Run time
macos \| stable	46s
macos \| beta	1m 2s
ubuntu \| stable	43s
cancel-previous-workflow	3s
ubuntu \| beta	35s
windows \| stable	1m 7s
windows \| beta	1m 2s
analyze / analyze	38s
analyze / cancel-previous-workflow	2s
analyze / package-analysis	1m 37s
	7m 35s

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