$_ENV['CI'] not nullable since v2.1.9 #12776
Description
Bug report
repro: https://github.com/atk4/ui/blob/235416b31066827226e462f1916d9fc99c0d14b4/demos/init-db.php#L556
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Line demos/init-db.php
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556 Offset 'CI' on non-empty-array on left side of ?? always exists and
is not nullable.
🪪 nullCoalesce.offset
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Looking into the release notes - maybe caused by phpstan/phpstan-src@d4d7e11, not sure. Environment variables passed into PHPStan must however not be assumed on runtime.
Code snippet that reproduces the problem
n/a
Expected output
no PHPStan error