v2.1.20-RC

Kotlin v2.1.20-RC delivers critical stability fixes across the K2 compiler, Compose plugin, and Gradle tooling. This release addresses type inference regressions, lambda handling issues in Compose, and build cache problems that affected multiplatform projects. Developers using Compose, Kotlin/Native, and multiplatform builds will see improved reliability and faster incremental builds.

Highlights

• Fixed K2 compiler type inference issues with nested lambdas and generic types
• Resolved Compose compiler crashes with lambda casting and function key metadata
• Fixed Kotlin Native release executable crashes and improved stability
• Improved Gradle build performance with configuration cache and parallel build fixes
• Enhanced multiplatform Gradle support for JVM targets and dependency resolution
• Fixed Kotlin/JS minification and webpack production builds