enable `experimental:strictDefs` #27947

Job	Run time
ubuntu-20.04 (batch: allowed_failures)	4m 47s
ubuntu-20.04 (batch: 0_3)	27m 48s
ubuntu-20.04 (batch: 1_3)	22m 5s
ubuntu-20.04 (batch: 2_3)	28m 47s
macos-13 (batch: allowed_failures)	7m 41s
macos-13 (batch: 0_3)	49m 43s
macos-13 (batch: 1_3)	33m 13s
macos-13 (batch: 2_3)	39m 20s
	3h 33m 24s

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