Description:
------------
Calling current() function on an empty custom ArrayIterator returns its properties.

https://3v4l.org/4MTF2

Bug present from PHP 7.4, prior versions are not affected

Test script:
---------------
class MyArrayIterator extends \ArrayIterator
{
    private $foo = 'bar';
}

$ai = new MyArrayIterator([]);
var_dump(count($ai));
var_dump($ai->current());
var_dump(current($ai));

Expected result:
----------------
int(0)
NULL
bool(false)

Actual result:
--------------
int(0)
NULL
string(3) "bar"