QByteArray::replace() is inconsistent with QString::replace() when *this isNull() and needle is empty

The following succeeds for String == QString, but fails for String == QByteArray:

{
    String h, n, rep = "a", res = rep;
    h.replace(n, rep);
   QCOMPARE(h, res);
}
{
    String h, n = "", rep = "a", res = rep;
    h.replace(n, rep);
    QCOMPARE(h, res);
}

Expected behaviour: QByteArray is consistent with QString (and tokenize()/split() + join() for that matter).