[Twisted-Python] Do Viewables absolutely have to be return'ed by Avatars?

[Daniel Sank]

>From some experimentation I find that the only way to make a Viewable
get a meaningful perspective argument when executing view_* methods is
to make sure that the references to that Viewable are given to clients
as return values from perspective_* methods called on a pb.Avatar.

In particular, if the Avatar gives a client a reference to a Viewable
by passing it as an argument to a remote_* method on the client,
subsequent invocations of view_* methods by the client result in
perspective argument in view_* methods being None.

I have attached a complete working example of a client and server that
succinctly illustrates this issue.

Question: Is there a way to distribute un-asked for references to
Viewables that properly get the perspective argument in their view_*
methods?

Sincerely,
Daniel Sank
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