If I could just add to that, it is a feature of these exemptions for cabinet confidences and other Canadian access laws that there are certain parameters drawn around them. On the question of timelines, there are very often so-called sunset provisions, after which it is not possible to rely on the exemption.
As for other provisions, there are cases, for example, when the government has publicly cited a decision that was taken in cabinet. In that instance, some of the protections that might otherwise exist are carved back. Obviously, it lies with the particular legislature to decide where those lines should be drawn.