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Output for 5.6.38, 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 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(8) { ["a1"]=> bool(true) ["b1"]=> string(3) "abc" ["c1"]=> string(3) "def" ["a2"]=> bool(true) ["b2"]=> string(3) "fgh" ["c2"]=> string(3) "ijk" ["d2"]=> string(3) "lmn" ["e2"]=> string(3) "opq" }

preferences:
129.02 ms | 413 KiB | 5 Q