enable `experimental:strictDefs` #27943

Job	Run time
ubuntu-20.04 (batch: allowed_failures)	4m 35s
ubuntu-20.04 (batch: 0_3)	31m 28s
ubuntu-20.04 (batch: 1_3)	22m 31s
ubuntu-20.04 (batch: 2_3)	23m 7s
macos-13 (batch: allowed_failures)	8m 5s
macos-13 (batch: 0_3)	37m 41s
macos-13 (batch: 1_3)	34m 32s
macos-13 (batch: 2_3)	28m 1s
	3h 10m 0s

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