Both MongoDB\Model\BSONDocument and MongoDB\Model\BSONArray extends the ArrayObject class. When one uses getArrayCopy on a document with nested documents / arrays these are not converted to arrays. Is this intended behavior?

This caused some issues for me when I wanted to encode a BSONDocument with nested documents/arrays as JSON:

<?php
use MongoDB\Model\BSONDocument,
    MongoDB\Model\BSONArray;

$document = new BSONDocument([
    'list' => new BSONArray([1, 2]),
]);
$arrayCopy = $document->getArrayCopy();

var_dump(
    $arrayCopy,
    json_encode($arrayCopy)
);
/*
array(1) {
  'list' =>
  class MongoDB\Model\BSONArray#23 (1) {
    private $storage =>
    array(2) {
      [0] =>
      int(1)
      [1] =>
      int(2)
    }
  }
}
string(22) "{"list":{"0":1,"1":2}}"
*/

As you can see the inner BSONArray is encoded as an object. I have worked around this with a function that recursively does getArrayCopy on all nested objects. I just thought I'd see if this behavior was intentional or not.