QML basic type rect has properties for left, right, top, bottom corresponding to the respective QRect or QRectF properties.

While the properties are documented as "read-only", writing to them produces no runtime error whatsoever leaving you wonder why it's not working.

I think those values should be writable from QML, so you can save yourself some client-side logic when you just want to move one of the edges of a rectangle without having to manually alter its size afterwards.

However, this could lead to people doing stupid things like

Foo {
    size.x: 100
    size.left: 150
} 

If adding this isn't desirable, then at least it should throw a TypeError like it normally does when trying to assign to a read-only property