Bugfixes 🐛

• Preserve maybe-certainty only for Variable when narrowing the base of ?->, ??, isset() and empty() (#6109), Bug: False positive "Cannot call method X() on Y|null" when using nullsafe operator on repeated function calls #15002, thanks @staabm and @VincentLanglet!
• Do not key the container cache on the turbo extension state (#6121)
• Fill the missing gaps in expr processing (phpstan/phpstan-src@eea2788)
• Resolve a relative include against the trait file in a trait context (#6127), thanks @zonuexe!
• Do not let type narrowing define a certainly-undefined variable (#6130), Confusing messaging for undefined variables in loops #2032
• Merge all callable acceptors' parameters into NativeParameterReflection when a closure is passed to a union of callables (#6128), Call to undefined method PHPStan\Reflection\Php\ExtendedDummyParameter::union() #15003, thanks @staabm and @VincentLanglet!
• Treat a property with a default value as always set in isset resolution (#6131), Invalid return type definition #10786
• Read already-processed expression types from ExpressionResults in NodeScopeResolver (#6139), Type inference fails with @phpstan-self-out #13253
• Resolve __DIR__ and __FILE__ against the trait file in a trait context (#6126), __DIR__ in include inside a trait is resolved against the using class directory #15015, thanks @zonuexe!

Performance 🏎️

• Reuse the scope factory of the other flavour (#6114)
• Remember chain levels that shortcircuit to themselves (phpstan/phpstan-src@ab11f34), expr printing bottleneck in nullsafe-chain-walk.php #14991
• Prevent unnecessary re-creation of union types (#6117), thanks @staabm!
• Remember an expression's printed form as the printer produces it (#6118), expr printing bottleneck in nullsafe-chain-walk.php #14991
• Prevent unnecessary re-creation of benevolent union types (#6119), thanks @staabm!
• Resume expression-asking fibers with ExpressionResults (phpstan/phpstan-src@9725942)
• Create merge conditionals from the differing holders only (#6141)

Internals 🔍

• ExprHandlerRegistry does not need to be AutowiredService (phpstan/phpstan-src@36392ba)
• Repeat a shadowed class's interfaces on its stub shell (#6113)
• Run the benchmark on PHP 7.4 in addition to PHP 8.5 (#6121)
• Check bench/data files with RequiredPhpVersionCommentTest (#6122), thanks @staabm!
• Introduce ExpressionResultFactory (phpstan/phpstan-src@8f5111f)
• ExpressionResult - add beforeScope (phpstan/phpstan-src@a7094b5)
• ExpressionResult - add Expr (phpstan/phpstan-src@abcce56)
• Eliminate the OriginalPropertyTypeExpr virtual node (#6129)
• Eliminate the GetOffsetValueTypeExpr virtual node (#6129)
• Eliminate the GetIterableKeyTypeExpr virtual node (#6129)
• Eliminate the GetIterableValueTypeExpr virtual node (#6129)
• Deduplicate constant-condition vs impossible-check reports via collectors instead of asking the type specifier inline (#6132)
• Replace SpecifiedTypes::normalize() with symbolic alternative-form entries (#6133)
• Resolve early-terminating calls to an explicit never type in the call handlers (#6134)
• Read operand types from ExpressionResults in Throw/BooleanAnd/Coalesce handlers (#6135)
• Read operand types from ExpressionResults in Ternary/ArrayDimFetch/PropertyFetch handlers (#6136)
• Read operand types from ExpressionResults in BinaryOp/BooleanOr/MethodCall/Match handlers (#6137)
• Read expression types from ExpressionResults in NodeScopeResolver and handlers (#6138)
• Fill the foreach key-loop native types with the native flavour (#6141)
• Run engine-feeding node-callback gatherers synchronously at the emission position (#6142)
• Track containsNullsafe on ExpressionResult and propagate it through fetch/call chains (#6143)