Currently an officer has to be satisfied that the misrepresentation essentially was not unintentional or accidental. There is a use of judgment there. Where they believe it was just an honest mistake, they're not actually found inadmissible.
For example, for A40 to be applied, for misrepresentation to be applied abroad, it's even a certain delegation of person, a certain level of individual, who has to make that call. Considerations are weighed very carefully before a finding of misrepresentation is made currently.
In terms of what other countries have, there are a few examples I have here. In the United States they do have a lifetime inadmissibility. In the United Kingdom it is up to a 10-year bar on re-entry, and Australia has a three-year bar.