I'd like to make it possible to pickle positions (in order to store
e.g. node expansion status that always pollutes our diffs in c.db).

I understand that I can use p.archivedPosition for this, but when I
unpickle this, I should be able to check its validity by ensuring that
it refers to same vnode. Now that I think of it, wouldn't unique vnode
id's provide a more robust (archived) representation of positions than
just node indices? Perhaps a form like foo.bar.baz where every element
is a vnode id.

-- 
Ville M. Vainio
http://tinyurl.com/vainio

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