compare() wrongly considers colors as equal

import QtQuick 2.2
import QtTest 1.0

Item {
    Rectangle {
        id: black
        color: "#000000"
    }

    Rectangle {
        id: white
        color: "#ffffff"
    }

    TestCase {
        name: "ColorComparison"

        function test_this_should_fail() {
            compare(black.color, white.color)
        }

        function test_this_is_ok() {
            compare(black.color == white.color, false)
            compare(Qt.colorEqual(black.color, white.color), false)
        }
    }
}