[Bug-kawa] [bug #16723] flattened serialization of lists

[Per Bothner]

Follow-up Comment #1, bug #16723 (project kawa):

I'm not really thrilled with this.
First and most critically, whatever we do here must continute to work with
the Kawa literals framework (gnu.expr.LitTable).  See:
http://www.gnu.org/software/kawa/internals/code-generation.html#literals
This is not insurmountable; worst case we could special-case the handling of
pair literals.
Second, I don't care for allocating a ProperListWrapper object in the middle
of serialization: I don't think it's necessary, at least if we're willing to
give up serialization compatibility.
Third, it appears this approach doesn't handle sharing.  It would be a shame
to lose that.

Now I am thinking about turning Pair into a more abstract class, with car/cdr
as virual methods.  So we could perhaps define a custom subclass of Pair that
would be serialized differently.  I don't know if that would work.  Or as
part of the serialization process you could convert to list to a vector
(presumably much more compact) and back again.

But perhaps in that case a vector or extendable vector type would  make more
sense?  (I think lists are way over-used.)

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