Kotlin issue with iterating through ranges

RangesIssue.kt

fun test1() {
    var x = 1f
    var y = 0

    for (a in 1 .. 1000) {
        for (b in 1 .. 1000) {
            for (c in 1 .. 1000) {
                x *= -1f
                y += 1
            }
        }
    }
}

fun test2() {
    var x = 1f
    var y = 0

    for (a in 1 until 1001) {
        for (b in 1 until 1001) {
            for (c in 1 until 1001) {
                x *= -1f
                y += 1
            }
        }
    }
}

fun main() {
    var time = 0L
    time = System.nanoTime()
    test1()
    println("Result using '..': ${(System.nanoTime() - time) / 1000000f} ms.")

    time = System.nanoTime()
    test2()
    println("Result using 'until': ${(System.nanoTime() - time) / 1000000f} ms.")

    println()
    println()

    time = System.nanoTime()
    test2()
    println("Result using 'until': ${(System.nanoTime() - time) / 1000000f} ms.")

    time = System.nanoTime()
    test1()
    println("Result using '..': ${(System.nanoTime() - time) / 1000000f} ms.")
}