[PyQt] findChild(Person, "person") for QML object fails?

[bootch at nc.rr.com]

QObject.findChildren() seems to show a child of the type Person (from pyqt QML example in the docs) and objectName=="person",
but findChild(Person, "person") doesn't.

Here is a snippet of the code:

    self.dumpQMLComponents(qmlRoot)
    
    #result = qmlRoot.findChild(Person, "person")
    result = qmlRoot.findChild(model.person.Person, "person")
    assert result is not None
    return result
  
  
  def dumpQMLComponents(self, root):
    children = root.findChildren(QObject)
    for item in children:
      # Note the QML id property is NOT the objectName
      print(item, "name is:", item.objectName())
      if isinstance(item, model.person.Person):
        print("Is Person")

And a snippet of the printed output:

<PyQt5.QtQuick.QQuickItem object at 0xb2c064ac>
<model.person.Person object at 0xb2c062b4> name is: person
Is Person
<PyQt5.QtCore.QObject object at 0xb2c064f4> name is: 
...
  File "/home/bootch/git/demoQMLPyQt/widgetApp/graphicsView.py", line 52, in findPicker
    assert result is not None
AssertionError


Its no big deal, I will just workaround.
Probably something I don't understand about Python types and C++ casting.
I can submit a complete small example.