Bugfixes 🐛

• Preserve maybe-certainty only for Variable when narrowing the base of ?->, ??, isset() and empty() (#6109), [#15002], thanks @staabm and @VincentLanglet!
• Do not key the container cache on the turbo extension state (#6121)
• Fill the missing gaps in expr processing (https://github.com/phpstan/phpstan-src/commit/eea2788d99ce05adb104fef837479d3e5aefe9fb)
• 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), [#2032]
• Merge all callable acceptors' parameters into NativeParameterReflection when a closure is passed to a union of callables (#6128), [#15003], thanks @staabm and @VincentLanglet!
• Treat a property with a default value as always set in isset resolution (#6131), [#10786]
• Read already-processed expression types from ExpressionResults in NodeScopeResolver (#6139), [#13253]
• Resolve __DIR__ and __FILE__ against the trait file in a trait context (#6126), [#15015], thanks @zonuexe!

Performance 🏎️

• Reuse the scope factory of the other flavour (#6114)
• Remember chain levels that shortcircuit to themselves (https://github.com/phpstan/phpstan-src/commit/ab11f34fe8c74921f277d1213858b80e0888e86d), [#14991]
• Prevent unnecessary re-creation of union types (#6117), thanks @staabm!
• Remember an expression's printed form as the printer produces it (#6118), [#14991]
• Prevent unnecessary re-creation of benevolent union types (#6119), thanks @staabm!
• Resume expression-asking fibers with ExpressionResults (https://github.com/phpstan/phpstan-src/commit/9725942bdd0523126e74bbf5741a8b7a147bda47)
• Create merge conditionals from the differing holders only (#6141)

Internals 🔍

• ExprHandlerRegistry does not need to be AutowiredService (https://github.com/phpstan/phpstan-src/commit/36392ba9ddee9ec8cb6b6fb2c589bdad56cae802)
• 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 (https://github.com/phpstan/phpstan-src/commit/8f5111fc6e2303497d615a74ca46f578b8d4f3e3)
• ExpressionResult - add beforeScope (https://github.com/phpstan/phpstan-src/commit/a7094b5bc0d3aa67a2f8fcfbbf3f35ebb7a64fa2)
• ExpressionResult - add Expr (https://github.com/phpstan/phpstan-src/commit/abcce5613c8d03bd816f0efeb3cc09d1685e5023)
• 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)