Source incompatible change in Qt 5.14's QML Binding (required argument restoreMode)

In Qt 5.14, the required parameter `restoreMode` was added to the `Binding` type. This makes all code that uses `Binding` print a warning. Warnings in our code causes exceptions to be thrown. Was this change an intentional source compatibility breakage?:

file:///[...].qml:409:17: QML Binding: Not restoring previous value because restoreMode has not been set. 

Here's how to reproduce (it seems like the normal way to use Binding):

Rectangle { 
    id: rrr
    Binding { 
        target: rrr 
        property: "color" 
        value: "red" 
        when: foo
    } 
} 

As there is no preprocessor in QML, code that needs to work with both 5.13 and 5.14, (e.g., during porting,) needs to make a new type, (e.g., UnbrokenBinding,) and based on Qt versions, selectively register either of the two implementations.