Webservices broken in ruby 182/rails actionwebservice (0.8.1)

is it appears that web services are broken in 1.8.2 and the latest
version of rails... this is the problem I'm having:
http://dev.rubyonrails.com/ticket/2553. specifically, I get the "can't
modify frozen object" error when I try to invoke a web service with
multiple parameters in the method.

can anyone else verify this? Seems like a major piece of functionality
to remain broken for so long, so it makes me wonder if I'm just doing
something wrong?

thanks
phil