Integer arithmethic with large number variants fails

The following code:

<?php
$int = 0x100000000;
var_dump(
    $int,
    new variant($int) + 1
);

Resulted in this output:

int(4294967296)

Fatal error: Uncaught TypeError: Unsupported operand types: variant + int in %s:%d

But I expected this output instead:

int(4294967296)
int(4294967297)

PHP-8.0

Windows x64

Oh, but casting to string would work:

> php -r "var_dump((string) new variant(0x100000000));"
string(10) "4294967296"

Fix phpGH-8778: Integer arithmethic with large number variants fails

Merge branch 'PHP-8.0' into PHP-8.1

Merge branch 'PHP-8.1'

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