Kotlin Function Reference Ambiguity

FunctionReferenceAmbiguity.kt

data class AdditionClass(val str: String, val num: Int) {
  fun add(addStr: String): String {
    return str + addStr
  }
  fun add(addNum: Int): Int {
    return num + addNum
  }
}


val addition = AdditionClass("Hello", 10)

// Compile Error!
val add = addition::add

// Success!
val addInt: (Int) -> Int = addition::add 

// Still Compile Error!
val addString = addition::add as (String) -> String