Add validation to function vars #7991

Job	Run time
integration-app-harness (redis, 3.11.11, 1)	6m 3s
integration-app-harness (redis, 3.11.11, 1)	6m 3s
integration-app-harness (redis, 3.11.11, 2)	6m 44s
integration-app-harness (redis, 3.11.11, 2)	6m 44s
integration-app-harness (redis, 3.12.8, 1)	6m 7s
integration-app-harness (redis, 3.12.8, 1)	6m 7s
integration-app-harness (redis, 3.12.8, 2)	6m 36s
integration-app-harness (redis, 3.12.8, 2)	6m 36s
integration-app-harness (redis, 3.13.1, 1)	8m 0s
integration-app-harness (redis, 3.13.1, 1)	6m 43s
integration-app-harness (redis, 3.13.1, 2)	6m 59s
integration-app-harness (redis, 3.13.1, 2)	6m 59s
integration-app-harness (memory, 3.11.11, 1)	5m 50s
integration-app-harness (memory, 3.11.11, 1)	5m 50s
integration-app-harness (memory, 3.11.11, 2)	6m 28s
integration-app-harness (memory, 3.11.11, 2)	6m 28s
integration-app-harness (memory, 3.12.8, 1)	5m 45s
integration-app-harness (memory, 3.12.8, 1)	5m 45s
integration-app-harness (memory, 3.12.8, 2)	6m 16s
integration-app-harness (memory, 3.12.8, 2)	6m 16s
integration-app-harness (memory, 3.13.1, 1)	5m 40s
integration-app-harness (memory, 3.13.1, 1)	5m 40s
integration-app-harness (memory, 3.13.1, 2)	6m 34s
integration-app-harness (memory, 3.13.1, 2)	6m 34s
	2h 32m 47s

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