array(3) {
  ["slug"]=>
  object(MongoDB\BSON\Regex)#24 (2) {
    ["pattern"]=>
    string(40) "biggest-initial-print-for-a-fiction-book"
    ["flags"]=>
    string(1) "i"
  }
  ["status"]=>
  string(9) "published"
  ["lang"]=>
  string(2) "ro"
}