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Output for 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.17, 8.4.1 - 8.4.4
The "chained" iterable contains all elements, using a generator: 1 2 3 4 5 However, when it comes to converting the generator to array, there is a caveat: Array ( [0] => 4 [1] => 5 [2] => 3 ) The issue is caused by overlapping keys. See how they appear in the sequence: [0] => 1 [1] => 2 [2] => 3 [0] => 4 [1] => 5 The issue is not present when the keys do not overlap: Array ( [0] => 1 [1] => 2 [2] => 3 [10] => 4 [11] => 5 )

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