Property signal handlers of list type

When I change value of property of list type the related signal handler is called as many times, as many elements the list include (which IMHO is not right - I would rather expect it to be called once, cause I'm changing the property value only once).

main.qt
{{
import Qt 4.7

Rectangle {
width: 200; height: 200
TestItem {
items: [
QtObject {},
QtObject {},
QtObject {}
]
}
}
}}

TestItem.qml
{{
import Qt 4.7

Item

{ id: testitem property list<QtObject> items onItemsChanged: console.log("Items changed: ", testitem.items.length) } }}

qmlviewer output
{{
$ qmlviewer main.qml
Items changed: 1
Items changed: 2
Items changed: 3
}}