support InputStream as method return type or last method arg to avoid client's hacking of protocol

Hi, another idea regarding Hessian. I'd think it's feasible to
implement the client interface of hessian that when the service method
takes its last argument as InputStream or Reader, or return
InputStream or Reader, the binary or character streams are
automatically wrapped.

I don't know if this feature is already implemented by 2.0 or 1.02,
seems it is not by 1.01 coz the "Hessian with large binary data"
section is still in the user guide
(http://www.caucho.com/resin-3.0/protocols/hessian.xtp). I don't think
this hack is needed if InputStream and Reader are properly wrapped.

Best Regards,
Compl