Bug report

If you do something like you will get "Strict comparison using !== between 1 and 1 will always evaluate to false." that is not true because $this->offset can be changed while yield.

foreach ([1, 2, 3] as $item) {
    $this->offset = 1;

    yield $index => $item;

    if ($this->offset !== 1) {
        throw new Exception('bug');
    }

    $index += $this->offset;
}

Code snippet that reproduces the problem

https://phpstan.org/r/4068130e-8b2e-4849-b751-c56b69dcf3bb
https://3v4l.org/d8R5J

Expected output

No error