What is the difference in the standard of review between reasonableness and unreasonableness?

Canada (Federal), Canada

The following excerpt is from Lau v. Canada (Citizenship and Immigration), 2008 FC 499 (CanLII):

While the parties agreed that the standard of review was patent unreasonableness, these submissions were before the decision in Dunsmuir v. New Brunswick, 2008 SCC 9. Although the standard of review is now clearly reasonableness, nothing turns on the distinction between the two standards.

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