Changelog

Compiler

• KT-83984 Data races around kotlinx.serialization plugin protobuf extensions registration
• KT-83317 ClassCastException: with cast kotlin.UInt to java.lang.Number when defining constant
• KT-83031 K2: unstable resolution of EnhancedNullability from type-use NotNull in presence of unused code
• KT-81700 flaky overload resolution behaviors (false-positive errors, different final candidates, compile-time failures)
• KT-83983 Revert of KT-83081
• KT-83314 JSpecify [@NullMarked](https://github.com/NullMarked) changes Java equals(Object) to equals(Any?) causing override conflict in Kotlin 2.3
• KT-82863 [@NoInfer](https://github.com/NoInfer) regression since 2.2.20
• KT-82841 "kotlin.NoWhenBranchMatchedException" in when with !is check & non-sealed class in the middle of hierarchy

JVM. Reflection

• KT-83608 Kotlin-reflect: "Unknown origin of public abstract operator fun invoke(p1: P1, p2: P2): R"
• KT-83361 "KotlinReflectionInternalError: Type parameter not found: 0" on super types with Kotlin 2.3.0
• KT-42199 "KotlinReflectionInternalError: Unknown origin of public abstract operator fun invoke" on function reference to FunctionN.invoke
• KT-81024 Reflection: New KType implementation fails on arguments comparison for a Nothing type parameter

Tools. Compiler Plugins

• KT-83266 "Unsupported class file major version 69" for "produceReleaseComposeMapping" task with Kotlin 2.3
• KT-83099 Compose compiler does not generate stack trace mappings for project files

Tools. Gradle

• KT-83070 The KGP api reference is missing a description
• KT-82459 Improve iOS simulator boot implementation

Tools. Gradle. JS

• KT-82946 Js, Wasm: Upgrade NPM dependencies

Tools. Gradle. Multiplatform

• KT-83687 Revert deprecation of 'androidTarget' for AGP lower than 9