- Extensive bug fixes across the compiler (diagnostics, overload resolution, JVM bytecode, JS translator) and IDE features (refactoring, navigation, debugger stepping).
- New IDE capabilities: compatibility with IDEA 2016 Kotlin Education Plugin, improved file chooser for moving declarations, and support for moving methods to companion objects.
- Performance enhancements in standard library functions (sum, average, drop/take) and faster reference search/completion.