It does, because the approach in Canada, for whatever reason—it's not the only approach to do it—is to put together a plan that adds up exactly but goes no further. Even this one doesn't go to 45%, even though the new target is 40% to 45%. There's no wiggle room. It is really like a series of needles to try to thread through, and if you don't get through one of them, you're not going to get to the target.
There's also the possibility of what I call “off-script” things happening on the sidelines that undermine the plan. You could even have a good plan, but other countervailing elements arise during its execution.
That's a lack of conservatism in the approach to planning. You have all these elements that have to work in order to make the total. Putting in some buffer room, whether it's “up to 45%” or something like that, would make it less of a threading of a series of needles. The government could consider putting in that buffer in a future plan so it doesn't have to add up exactly to the decimal point and anything less than that would fail.