1.3.16 throwing errors on arrays after assertCount

[acbramley]

Our automated updates updated to 1.3.16 today and started failing phpstan. Based on the changes from 1.3.15 it's obvious what the issue is.

Our tests do something like this:

    $mails = $this->getMails();
    $this->assertCount(1, $mails);
    $mail = \reset($mails);
    $this->assertStringContainsString('foo', $mail['subject']);

Where getMails returns an array.

And this is throwing errors like Cannot access offset 'subject' on false.

[ondrejmirtes]

Can you put it some dumptType calls to see what's happening with the types? See https://phpstan.org/user-guide/troubleshooting-types#debugging