API Replace Extension subclasses #537

Job	Run time
CI / Generate matrix	14s
CI / Context	1s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	2m 52s
CI / 8.2 mariadb phpunit all	3m 5s
CI / 8.3 mysql80 phpunit all	3m 21s
CI / 8.1 mysql57 phplinting	1m 53s
CI / 8.1 mysql57 endtoend root job1	7m 45s
CI / 8.3 mysql80 endtoend root job1	8m 53s
CI / 8.1 mysql57 endtoend root job2	4m 13s
CI / 8.3 mysql80 endtoend root job2	4m 59s
CI / 8.1 mysql57 endtoend root job3	3m 50s
CI / 8.3 mysql80 endtoend root job3	4m 6s
CI / 8.1 mysql57 endtoend root job4	4m 30s
CI / 8.3 mysql80 endtoend root job4	4m 49s
CI / 8.1 mysql57 endtoend root job5	5m 28s
CI / 8.3 mysql80 endtoend root job5	5m 54s
CI / 8.1 mysql57 endtoend root job6	4m 50s
CI / 8.3 mysql80 endtoend root job6	4m 35s
CI / 8.1 mysql57 endtoend root job7	11m 45s
CI / 8.3 mysql80 endtoend root job7	11m 6s
CI / 8.1 mysql57 js	4m 40s
CI / 8.1 mysql57 doclinting	2m 28s
CI / Dispatch tag patch release	0s
	1h 45m 18s

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