NEW: Add IsFirst/IsLast methods to match SS5 conventions (closes #1274) #4

Job	Run time
CI / Context	1s
CI / Generate matrix	10s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	2m 43s
CI / 8.2 mariadb phpunit all	1m 1s
CI / 8.3 mysql80 phpunit all	1m 6s
CI / 8.1 mysql57 phplinting	1m 20s
CI / 8.1 mysql57 endtoend root job1	1m 53s
CI / 8.3 mysql80 endtoend root job1	2m 23s
CI / 8.1 mysql57 endtoend root job2	1m 43s
CI / 8.3 mysql80 endtoend root job2	2m 23s
CI / 8.1 mysql57 endtoend root job3	1m 39s
CI / 8.3 mysql80 endtoend root job3	2m 0s
CI / 8.1 mysql57 endtoend root job4	1m 48s
CI / 8.3 mysql80 endtoend root job4	2m 8s
CI / 8.1 mysql57 endtoend root job5	1m 43s
CI / 8.3 mysql80 endtoend root job5	2m 3s
CI / 8.1 mysql57 endtoend root job6	1m 57s
CI / 8.3 mysql80 endtoend root job6	2m 0s
CI / 8.1 mysql57 endtoend root job7	1m 46s
CI / 8.3 mysql80 endtoend root job7	2m 14s
CI / 8.1 mysql57 js	1m 3s
CI / 8.1 mysql57 doclinting	1m 5s
CI / Dispatch tag patch release	0s
	36m 10s

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