ENH Improve type safety to support refactored template layer #471

Job	Run time
CI / Generate matrix	2m 21s
CI / Context	1s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit all	3m 3s
CI / 8.3 mysql80 phpunit all	3m 46s
CI / 8.3 mysql80 phplinting	2m 13s
CI / 8.3 mysql80 endtoend root job1	9m 22s
CI / 8.3 mysql80 endtoend root job1	9m 7s
CI / 8.3 mysql80 endtoend root job2	9m 11s
CI / 8.3 mysql80 endtoend root job2	9m 1s
CI / 8.3 mysql80 endtoend root job3	7m 3s
CI / 8.3 mysql80 endtoend root job3	7m 1s
CI / 8.3 mysql80 js	5m 9s
CI / Dispatch tag patch release	0s
	1h 7m 19s

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