Colors with alpha are not handled property by QML when returned by JavaScript

When returning a color that has an alpha value different from 1.0 from a JavaScript function, the alpha value is lost and set to 1.0

Program reproducing the issue:

import QtQuick 2.0

Item {
property color origColor: Qt.rgba(1.0, 1.0, 1.0, 0.2)
property color destColor: {
if (true)

{ return origColor; } else { return origColor; }

}
Component.onCompleted: print("Completed, destColor.a =", destColor.a)
onDestColorChanged: print("Changed, destColor.a =", destColor.a)
}