[PHP-NOTES] note 130509 added to class.limititerator

Note that the keys are NOT altered by LimitIterator, so:

$items = new LimitIterator([0 => 'foo', 1 => 'bar', 2 => 'baz'], 1, 1);

// $items is effectively [1 => 'bar']
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Manual Page -- https://php.net/manual/en/class.limititerator.php
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