$object = new class implements \Stringable {
    public function __toString()
    {
        return 'string';
    }
};
$this->render('test.twig', ['array' => ['string' => 'value'], 'object' => $object]);

(($_v0 = ($context["array"] ?? null)) && is_array($_v0) || $_v0 instanceof ArrayAccess ?
        ($_v0[($context["object"] ?? null)] ?? null) : null)

 CoreExtension::getAttribute(
        $this->env,
        $this->source,
        (isset($context["array"]) || array_key_exists("array", $context) ? $context["array"] : (function () {
            throw new RuntimeError('Variable "array" does not exist.', 1, $this->source);
        })()),
        (isset($context["object"]) || array_key_exists("object", $context) ? $context["object"] : (function () {
            throw new RuntimeError('Variable "object" does not exist.', 1, $this->source);
        })()),
        [],
        "array",
        false,
        false,
        false,
        1
    )

if (match (true) {
    \is_array($object) => \array_key_exists($arrayItem = (string) $arrayItem, $object),
    $object instanceof \ArrayAccess => $object->offsetExists($arrayItem),
    default => false,
}) {

    ....

    return $object[$arrayItem];
}