[jQuery] Jquery.param encoding wrong

Hello, I think that the param function doesn't work well, it doesn't
encode to the url format. For example :
jQuery.param({test:"béton"})
return :
test=b%C3%A9ton
while it has to return :
test=b%E9ton
This problem is present in the form plugin, the ajax.submit function
use "param" and so it doesn't work well too.
Thanks!