Exception during string cast in PHP 8

Using PHP8 nd the latest WP version, the RollingCurlX class seems to throw an exception when casting the curl handle to string.
Since PHP 8 introduced a CurlHandle class, this might need to be changed from
$key = (string) $ch;
to
$key = spl_object_hash($ch);
If you want to keep compatibility to older PHP Version you might want to wrap it in some kind of if-else
if(is_resource($ch)) {
$key = (string) $ch;
} else {
$key = spl_object_hash($ch);
}