<?php declare(strict_types = 1);

$a = [1, new stdClass()];
$b = array_map(function (string $s) : string { return $s; }, $a);

Expected: argument passed to first arg of array_map is wrong
Actual: No issues

https://phpstan.org/r/15291a0f-d267-4eec-87d3-61ef0803df57

Would have flagged this code:

which expects is passed string[]|\PHPStan\Analyser\Error[]