Unable to extract generic's type from proxies created by Guice

Originally, this bug (or, possible, lack of functionality) was reported on RESTEasy's bug tracker, but I've been asked to ask for assistance here, too.

Original bug report: https://issues.redhat.com/browse/RESTEASY-2484

There you can find details and demo app demonstrating an issue, but in essence, it seems that AssistedInject **in combination with** Interceptors generates proxy classes from which in runtime RESTEasy can't extract generic types from method parameters. What gives me hope that this is just a bug rather than unfixable type-erasure related problem is that both AssistedInject and Interceptors generate "valid" proxies if used **alone**. Problem exists only if they are used in combination (see demo app and comments in original bug report).

Note: I'm not RESTEasy developer, I merely found and reported the issue. I'm really not sure if this is RESTEasy's issue or Guice's, but I've been asked to ask here for assistance, so I'm asking. I can provide testing of any kind, but I'm not an expert on RESTEasy internals.

In any case, thanks for **any** assistance in advance.