qmllint does not recognize "transparent" as a valid colour

Window {
    width: 640
    height: 480
    visible: true

    Rectangle { color: "green" } // No warning (Expected) 
    Rectangle { color: "nonexistentcolor" } // `Invalid color "nonexistentcolor". [Quick.color]` (Expected)
    Rectangle { color: "transparent" } // `Invalid color "transparent". [Quick.color]` (NOT Expected)
}