JetBrains has released Kotlin 1.6.20, a new release of the Kotlin language that features better interoperability with generic Java classes as well as faster build times. Some features cited in the release are still in preview form.
Improved interoperability with generic Java classes and interfaces was enabled through the inclusion of definitely non-nullable types, a feature currently in a beta stage. Kotlin 1.6.20 allows developers to mark a generic type parameter as definitely non-nullable using the new syntax,
T & Any.