Improvements 🔧

New option excludePaths that replaces excludes_analyse and allows for more granular settings - different exclusions for analysed paths and discovering symbols in 3rd party code (phpstan/phpstan-src@bf35a10) - #3749, #1796. Read more about it in this comment.
Clear cache directory - delete old containers (phpstan/phpstan-src@db0a5f6), #4328

Bugfixes 🐛

Generics - do not generalize array shape (phpstan/phpstan-src@94e3443)
Arrow functions - allow more precise return type even when native return type is present (phpstan/phpstan-src@3d0ac6f), #4275
array_filter w/ arrow functions return type extension (#402), thanks @b1rdex!
Make IntegerRangeType represent open intervals properly (#409), #577, thanks @jlherren!
Improve specified type in comparisons (#390), thanks @jlherren!
Register missing SplObjectStorage stub (phpstan/phpstan-src@143741c)
Solve issues with arrow functions containing void expression (phpstan/phpstan-src@7ac6383), #4292, #3348
Fix isset() bug (phpstan/phpstan-src@3d6461c), #4290
Fix infinite recursion with count() calls in TypeSpecifier (phpstan/phpstan-src@69e68a7), #4300

Fix function signatures for preg_replace_callback* for PHP 7.4+ (#411), thanks @jabrandes!
Sync array_unique parameter names with PHP 8 (phpstan/phpstan-src@9e7bdf7)