Bug report

phpstan complains that array_key_exists() expects int|string for $key, but on php.net it's documented as string|int|float|bool|resource|null

https://www.php.net/manual/en/function.array-key-exists.php

This was changed from int|string for PHP 8.0.0 in php/doc-en#3135

Code snippet that reproduces the problem

https://phpstan.org/r/29df4267-f360-49ed-8dfd-a1f52e5e2e07

Expected output

The always evaluate to true/false comments may be valid, but it should not complain about the type for $key

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