Describe the bug

I have this old snippet https://github.com/WPBP/WordPress-Plugin-Boilerplate-Powered/blob/master/plugin-name/backend/views/settings.php#L258 that use 2 parameter with 2 strings but PHPStan report that the second one is an integer of the Post ID (WPBP/WordPress-Plugin-Boilerplate-Powered#162).

Looking on internet in old articles like https://bigwing.com/blog/create-wordpress-cpt-archive-content-with-cmb2/ the second parameter it was a string.

Looking at the code

But if I configure a string as that parameter is used as key to save the settings.
So I don't know if I am doing it wrong or that parameter accept a string and also a integer.