libkotlinx-atomicfu-java 0.11.12-2build2 (amd64 binary) in ubuntu lunar

 AtomicFU is a library that provides the idiomatic and effective way of using
 atomic operations in Kotlin: Code it like a boxed value, but run it efficiently
 as java.util.concurrent.atomic.AtomicXxxFieldUpdater. Kotlin-specific
 extensions (e.g. inline loop, update, updateAndGet functions), atomic arrays,
 user-defined extensions on atomics and locks.