QVariant::compare always returns QPartialOrdering::Unordered when used with QColor

When iterating through a QVariantList to find the index of a certain value I am using QVariant::compare() == QPartialOrdering::Equivalent to find a specific element.

But when the QVariantList contains QColors I cannot find any element indexes because QVariant::compare always returns QPartialOrdering::Unordered. 

Here is a simple way to reproduce it:

QColor red1 = "red";
QColor red2 = "red";
qDebug()<<red1<<red2;
qDebug()<<cellValue.toString()<<val.toString();
qDebug()<<(red1 == red2);
qDebug()<<(QVariant::compare(red1, red2) == QPartialOrdering::Equivalent);
qDebug()<<(QVariant::compare(red1, red2) == QPartialOrdering::Greater);
qDebug()<<(QVariant::compare(red1, red2) == QPartialOrdering::Less);
qDebug()<<(QVariant::compare(red1, red2) == QPartialOrdering::Unordered); 

I understand there is no good ways to "sort" colors but I think QVariant::compare should at least return QPartialOrdering::Equivalent in this case

Edit: for now, I simply workaround this by doing val1==val2 because I need a strict equality but there might be cases where QVariant::compare might be more usefull