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Output for 5.6.38, 7.0.0 - 7.0.31, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 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] => stdClass Object ( ) [1] => a [2] => b [3] => fqcn [4] => a ) Array ( [5] => stdClass Object ( ) [1] => a [2] => b )

preferences:
175.3 ms | 413 KiB | 5 Q