versions 5 and earlier have a bug that results in url variables declared
multiple times to only result in a single value rather than a list of
values. this has been fixed in cfmx. for example:

?foo=bar&foo=far&foo=boo

url.foo should equal bar,far,boo. in cfmx it is. in cf5 it will equal the
last value of the last variable it encounters boo.