Rails - Nov 2005 - Creating case-inensitive route components?

Hi,

On my new Rails based site I''d like to allow parts of the
URLs accepted to be case-insensitive.  That is, these should
all be accepted:

      http://example.org/foo/action
      http://example.org/Foo/action
      http://example.org/FOO/action

      etc.

I''ve setup a route like this in routes.rb:

ActionController::Routing::Routes.draw do |map|
     map.connect '':foo/something'',
                 :foo => /foo/i,
                 :controller => ''foo'',
                 :action => ''something''

     ...

But that doesn''t seem to work for :foo components in anything
but lower case.

If I use this route:

ActionController::Routing::Routes.draw do |map|
     map.connect '':foo/something'',
                 :foo => /[fF][oO][oO]/,
                 :controller => ''foo'',
                 :action => ''something''

     ...

That does work.  Can someone explain what''s happening here?

Stu