Mutable Data Classes #5810

Job	Run time
cancel-previous-workflow	2s
macos \| stable	54s
macos \| beta	51s
ubuntu \| stable	41s
ubuntu \| beta	43s
windows \| stable	1m 31s
windows \| beta	1m 11s
analyze / analyze	38s
analyze / cancel-previous-workflow	3s
analyze / package-analysis	1m 34s
	8m 8s

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