In PHP <7.2 you can create arrays that can no longer be accessed properly:
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You can do some things with it.
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The root of all evil is in bug # 61655 . As a workaround, you can turn the botched array back into an object and cast it in a different way:
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Or you can do without numeric strings as keys - PHP casted every numeric string as key of an associative array as integer anyway.