Specifying a :format in link_to doesn't work in rails 3.2.2

I'm moving a project from rails 3.1 to rails 3.2.2 and I have this: ``` = link_to 'CSV', :action => 'list', :search => @search, :format => 'csv' ``` In rails 3.1 this specifies the format in the html link (format=csv) and it is caught by a respond_with, but in 3.2.2 the format never makes it into the link. I scanned through the list of commits on github and can't find anything that relates to this. Edit: Looks like this is an issue with url_for ``` #rails 3.1 url_for :controller=>'posts', :action=>'index', :format=>:xml /admin/posts/index?format=xml #rails 3.2.2 url_for :controller=>'posts', :action=>'index', :format=>:xml /admin/posts/index #rails 3.2.2 url_for :controller=>'posts', :action=>'index', :format=>:xml, :id => 5 /admin/posts/index/5.xml ```