Clarify that interceptors must be implemented using subclassing, and clarify 
the behaviour of self-invocation
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                 Key: CDI-44
                 URL: https://issues.jboss.org/browse/CDI-44
             Project: CDI Specification Issues
          Issue Type: Feature Request
            Reporter: Stuart Douglas


When implementing interception using proxying the behaour of self invocation is 
quite well defined, if a method is invoked on the proxy it is intercepted, if 
it is invoked on the actual bean (usually through self-invocation) it is not.

When implementing interception though sub classing this is much less well 
definied, and the only way to track if an invocation is intercepted or not is 
through a thread local flag. At the moment in weld this is reset when a call is 
made on a client proxy, so if we have an intercepted bean A and a SessionScoped 
bean B and A invokes B when invokes A the second call to A is intercepted. If 
however B is pseudo scoped, then the second invocation is not intercepted. The 
correct behaviour here should be specified by the specification.

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