What does this boundary parser print?

sealed interface Quantity {
    data class Valid(val value: Int) : Quantity
    data class Invalid(val raw: String?) : Quantity
}

fun parse(raw: String?): Quantity {
    val value = raw?.trim()?.toIntOrNull()
    return if (value != null && value in 1..10) {
        Quantity.Valid(value)
    } else {
        Quantity.Invalid(raw)
    }
}

fun main() {
    println(listOf(" 3 ", "0", null).map(::parse))
}