I'm lost in generic expect/actual common:

expect class WeakReference<T>(instance: T) {
    fun get(): T?
}

jvm:

actual typealias WeakReference<T> = java.lang.ref.WeakReference<T>

native:

actual typealias WeakReference<T> = kotlin.native.ref.WeakReference<T>

jvm works, native fails with message "The following declaration is incompatible because upper bounds of type parameters are different: public actual typealias WeakReference<T> = WeakReference<T>" What it wants?

In my case, I did WeakReference by type by creating another typealias for your generic as "Context" and then on each platform tell what the Context should be, which in turn can be a generic. Not really sure if it fits your specific usecase tho

This is what I am using in my project. I do have the new type inference enabled so maybe that makes the difference? Common:

expect class WeakReference<T : Any>(referred: T) {

    fun clear()

    fun get(): T?
}

JVM:

actual typealias WeakReference<T> = java.lang.ref.WeakReference<T>

Native:

actual typealias WeakReference<T> = kotlin.native.ref.WeakReference<T>