enable `experimental:strictDefs` #27951

Job	Run time
ubuntu-20.04 (batch: allowed_failures)	5m 2s
ubuntu-20.04 (batch: 0_3)	25m 42s
ubuntu-20.04 (batch: 1_3)	20m 57s
ubuntu-20.04 (batch: 2_3)	29m 49s
macos-13 (batch: allowed_failures)	7m 58s
macos-13 (batch: 0_3)	47m 16s
macos-13 (batch: 1_3)	36m 52s
macos-13 (batch: 2_3)	39m 14s
	3h 32m 50s

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