[repost][serialization] generic runtime helpers

Hello, allow me to repost the following lest my first try went unnnoticed:

The section on proposed case studies for Boost.Serialization talks
about the poosible inclusion of a so-called "generic runtime helper":

http://tinyurl.com/6khxns
http://www.boost.org/doc/libs/1_36_0/libs/serialization/doc/new_case_studies.html#archivehelper

which subject I had the pleasure to discuss with Mr. Ramey some
time ago. I've got a couple of questions regarding this feature:

1. Is there any tentative release version for getting this included?
2. Is the idea to include the generic runtime helper as part of the
core API of an Archive, or will it be just an adaptor? In other
words, would the core "Saving Archive" and "Loading Archive"
concpets be extended to also feature this runtime helper?

FWIW, I'm strongly in favor of having the runtime helper be part of
the core Archive concepts: it is my stance that this can be incredibly
useful to implement serialization code for types with special
lifetime semantics (as is the case with boost::shared_ptr
and boost::flyweight) without violating the encapsulation either of the
type or of Boost.Serialization. The key and only property of such a
runtime helper is its ability to associate an Archive object with a
type-dependent helper object, which I see as a very modest, yet
highly useful, extension to the Archive concept.

Just to exemplify how useful helpers can be, allow me to sketch the
serialization process of flyweight<T> as implemented with runtime
helpers: