将Kotlin中的函数变量委托给通用类

我目前正在开发一个需要委托函数变量的应用程序.我在try 这样做时遇到了一些问题.以下是一个最小的可重复示例的代码:

package org.prismsus.tank

import kotlin.reflect.KProperty
fun addFunc(a : Int, b : Int) : Int {
    return a + b
}

class Test{
    inner class PrintFuncCall1{
        operator fun getValue(thisRef: Any?, property: KProperty<*>): (Int, Int) -> Int {
            fun temp(a : Int, b : Int) : Int {
                println("Function ${property.name}")
                return addFunc(a, b)
            }
            return ::temp
        }
    }
    val delegatedFun1 : (Int, Int) -> Int by PrintFuncCall1()


    inner class PrintFuncCall2<F : (Array<out Any>) -> R, R>{
        operator fun getValue(thisRef : Any?, property : KProperty<*>) : (Array<out Any>) -> R{
            fun temp(vararg params : Any) : R{
                println("Function ${property.name}")
                println("Params: ${params.joinToString()}")
                return addFunc(params[0] as Int, params[1] as Int) as R
            }
            return ::temp
        }
    }

    val delegatedFun2 : (Int, Int) -> Int by PrintFuncCall2()
}

fun main(){
    val test = Test()
    println(test.delegatedFun1(1, 2))
    println(test.delegatedFun2(3, 4))
}

在这里，delegatedFun1和PrintFuncCall1工作得很好.然而，我try 将委托类修改为通用类，发现这不起作用.具体来说，我遇到了delegatedFun2和PrintFuncCall2的编译错误:

Property delegate must have a 'getValue(Test, KProperty<*>)' method. None of the following functions is suitable: 
public final operator fun getValue(thisRef: Any?, property: KProperty<*>): (Array<out Any>) -> ??? defined in org.prismsus.tank.Test.PrintFuncCall2

我不太明白为什么getValue需要thisRef才是类型Test，这是更大类别的类型.这尤其奇怪，因为我正在委托(Int, Int) -> Int类型的变量.此外，即使我try 将getValue的签名更改为getValue(thisRef : Test, property : KProperty<*>)，我也会出现以下错误:

Property delegate must have a 'getValue(Test, KProperty<*>)' method. None of the following functions is suitable: 
public final operator fun getValue(thisRef: Test, property: KProperty<*>): (Array<out Any>) -> ??? defined in org.prismsus.tank.Test.PrintFuncCall2

除此之外，我还有一个小问题是Kotlin对类型参数的约束机制.我对PrintFuncCall2的目的是将F标记为函数的类型，并将R标记为函数F的返回值.然而，当将getValue的签名从getValue(thisRef : Test, property : KProperty<*>) : (Array<out Any>) -> R更改为getValue(thisRef : Test, property : KProperty<*>) : F时，我在第return ::temp行收到了IDE的这条消息:

Required:
KFunction1<Array<out Any>, R>
Found:
F

这两个不应该是一回事吗？