canonical does not work on query parameters

[rkleemann]

I would expect that canonical would work on query parameters as well as the other parts in the URL. It appears that it does not:

$ perl -MURI -E 'say do { $u = URI->new("http://www.example.com?a=1 2 3&b=?")->canonical; $u }'
http://www.example.com?a=1%202%203&b=?

$ perl -MURI -E 'say do { $u = URI->new("http://www.example.com?a=1 2 3&b=?")->canonical; $u->query_form($u->query_form); $u }'
http://www.example.com?a=1+2+3&b=%3F

Which of the above forms would be the correct answer for canonical?