Description:
------------
As of PHP 8.0 objects cannot be used as string offsets, but they still emit an E_WARNING about conversion to int on top of the TypeError

Test script:
---------------
<?php
$s = 'Hello';
$o = new stdClass();
try {
    $s[$o] = 'A';
} catch (\Throwable $e) {
    echo $e->getMessage(), "\n";
}
try {
    var_dump($s[$o]);
} catch (\Throwable $e) {
    echo $e->getMessage(), "\n";
}
?>

Expected result:
----------------
Cannot access offset of type stdClass on string
Cannot access offset of type stdClass on string

Actual result:
--------------
Warning: Object of class stdClass could not be converted to int in /in/YhEYe on line 11
Cannot access offset of type stdClass on string

Warning: Object of class stdClass could not be converted to int in /in/YhEYe on line 16
Cannot access offset of type stdClass on string