Bugfixes 🐛

• Use declared property type instead of scope-narrowed type when inferring generic new expression types (#5467), #11844, thanks @VincentLanglet and @staabm!

Performance 🏎️

• Use pairwise TypeCombinator::intersect folding for conditional expression holders to avoid exponential union distribution (#5482), #14475
• Fix more cases (#5482), #14475
• More pair-wise intersect (#5482), #14475
• Avoid 2^N getAllArrays() expansion in implode() return type extension (#5482), #14475
• Avoid 2^N getAllArrays() expansion in ConstantArrayType::getFiniteTypes() (#5482), #14475
• Bail early in TypeUtils::flattenTypes() to avoid 2^N getAllArrays() expansion (#5482), #14475
• Batch unionWith in specifyTypesForFlattenedBooleanOr falsey path to avoid O(N²) (phpstan/phpstan-src@7eab3d2)
• Add flattening optimization for deep BooleanAnd chains in truthy context (phpstan/phpstan-src@3f5f2de)
• Use hash map for O(1) key lookup in ConstantArrayType (phpstan/phpstan-src@8019f65)
• Fix infinite hang when analysing src/wp-includes/user.php in wordpress-develop (#5485)

Function signature fixes 🤖

• Update session_set_save_handler $gc parameter (#5474), thanks @sreichel!

Internals 🔍

• Fix PHPUnit warning (#5484), thanks @VincentLanglet!