Borderless/CloseGadget/DepthGadget/DragBar attributes seem to be Settable

[deadwood2]

In Odyssey the following code is used to move the browser window into "full screen"

        set(obj, MUIA_Window_Borderless, TRUE);
        set(obj, MUIA_Window_DragBar, FALSE);
        set(obj, MUIA_Window_CloseGadget, FALSE);
        set(obj, MUIA_Window_DepthGadget, FALSE);

Documentation (Zune, AmigaOS MUI5 on github and MorphOS SDK 3.16) specifies that these attributes are only "I" (valid at creation) but this piece of code suggests these attributes are settable.