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Output for 7.4.20, 8.0.1 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.19, 8.4.1 - 8.4.5
array ( 0 => 'a', 1 => 'b', 2 => 'c', 3 => 'd', )

preferences:
88.03 ms | 411 KiB | 5 Q