December 5, 2020

Kotlin v1.4.20 released, JVM-based programming language

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Kotlin is a statically typed, cross-platform, general-purpose programming language with type inference. Kotlin is designed to interoperate fully with Java, and the JVM version of its standard library depends on the Java Class Library, but type inference allows its syntax to be more concise. Kotlin mainly targets the JVM but also compiles to JavaScript or native code (via LLVM). Kotlin is sponsored by JetBrains, a software development company based in Prague, and is also backed by Google under the Kotlin Foundation.

Kotlin is officially supported by Google for mobile development on Android. Since the release of Android Studio 3.0 in October 2017, Kotlin is included as an alternative to the standard Java compiler. The Android Kotlin compiler lets the user choose between targeting Java 6 or Java 8 compatible bytecode.

Changelog v1.4.20 


  • KT-42121 Deprecate Kotlin Android Extensions compiler plugin
  • KT-42267 Platform declaration clash error in IDE when using
  • KT-42406 Long or infinite code analysis on simple files modification

Backend. Native

  • KT-27534 Bridges to Nothing-returning methods have incorrect signature
  • KT-30284 Native: Nothing? type for expression override and crash
  • KT-36430 Optimize when with in range cases
  • KT-38787 Missing optimization for “in range” check
  • KT-39100 Make Native behaviour of property initialization consistent with JVM
  • KT-39798 Override equals/hashCode in functional interface wrappers on Native
  • KT-39800 equals/hashCode on adapted function references on Native
  • KT-41394 Compilation failed: Backend Internal error: Exception during IR lowering
  • KT-41907 Framework test segfaults on GC on watchos_x86 compiled with -opt