contains
Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0) 
fun contains(element: ULong): Boolean
    © 2010–2020 JetBrains s.r.o. and Kotlin Programming Language contributors
Licensed under the Apache License, Version 2.0.
    https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-u-long-array/contains.html