Bug report

When trying to check if an array contains any NULL values. The in_array function can be used with the strict flag set.
However PHPStan is not picking up that the values cannot be null inside of the array.

Code snippet that reproduces the problem

https://phpstan.org/r/69897217-fd94-497b-9e98-4baa6b2b96db

Expected output

The output should mention string is givin instead of string|null.

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