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Output for 8.0.0, 8.1.30 - 8.1.32, 8.2.23 - 8.2.28, 8.3.5 - 8.3.19, 8.4.1 - 8.4.5
Array ( [-2] => a [-1] => b [0] => c )
Output for 7.3.33, 7.4.0
Array ( [-2] => a [0] => b [1] => c )

preferences:
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