ci2 rooter bug ?

[eluser]quasiperfect[/eluser]
i was testing ci2 and by mistake i called a controller (in the controller i use the remap function) like this controller/?A and it returned a 404

if u call the controller with controller/? it works

if u call the controller with controller/a? it works

if u call the controller with controller/a?a returns a 404

if u call the controller with controller/a?? returns the uri you submitted has disallowed characters

in all cases it should trow a The URI you submitted has disallowed characters.

so is a bug or not ?

[eluser]quasiperfect[/eluser]
anyone ?