PDO.Iterator.class.php have return method declare problem in php 8.1 version about php-pdo-mysql-class HOT 3 OPEN

public function __construct(PDOStatement $pdo, $fetchMode = PDO::FETCH_ASSOC) {
    $this->position = 0;
    $this->pdo = $pdo;
    $this->fetchMode = $fetchMode;
}

function rewind():void {
    $this->position = 0;
    $this->pdo->execute();
    $this->nextResult = $this->pdo->fetch($this->fetchMode, PDO::FETCH_ORI_NEXT);
}

function current(): mixed {
    return $this->nextResult;
}

function key(): mixed {
    return $this->position;
}

function next():void {
    ++$this->position;
    $this->nextResult = $this->pdo->fetch($this->fetchMode, PDO::FETCH_ORI_NEXT);
}

function valid():bool {
    $invalid = $this->nextResult === false;
    if ($invalid) {
        $this->pdo->closeCursor();
    }
    return !$invalid;
}