How can I avoid creating a property binding on initialization in QML?

Question

I want to create a custom QML component with two properties one and two, which should have default values when left uninitialized. In particular, i

Answer 1

Explicitly break the binding upon component completion:

Rectangle {
    property int one: 1
    property int two: 2 * one
    Component.onCompleted: two = two
}

The two = two assignment breaks the binding and two is no longer updated as one changes.