urlParam

fun <C> Component<C>.urlParam(    router: Router,     name: String,     default: Int,     onChange: (Int) -> Unit? = null): ReadWriteProperty<Component<C>, Int>
fun <C> Component<C>.urlParam(    router: Router,     name: String,     default: String,     onChange: (String) -> Unit? = null): ReadWriteProperty<Component<C>, String>