Return same value as same Index start and end on replaceRange

[Jaehwa-Noh]

This is replaceRange but, It does insert.
When set the same Index on start and end, it have done append CharSequence currently. But it should be nothing changed.

https://pl.kotl.in/3jc8tMz2B

fun main() {
    val origin = "123"
    val replaced = origin.replaceRange(startIndex = 1, endIndex = 1, replacement = "9")
	
    println(replaced)
    // 1923
}