Use of QVariant conversions cause asymmetric and intransitive operator==()

int main()
{
    QVariant v1(97);
    QVariant v2(QUrl("a"));
    QVariant v3(QChar('a'));
 
    QMap<QVariant, int> s1;
    s1.insert(v1, 1);
    s1.insert(v2, 1);
    s1.insert(v3, 1);
 
    QMap<QVariant, int> s2;
    s2.insert(v3, 1);
    s2.insert(v2, 1);
    s2.insert(v1, 1);
 
    assert(s1.size() == 2);
    assert(s2.size() == 1);
 
    return 0;
}