On Tue, Apr 19, 2011 at 11:31 AM, Alex Shinn <alexshinn@gmail.com> wrote:
>
> [...] so without weighing the pros
> and cons too heavily (4) stands out as possibly the safest
> option.

Sorry, I forgot to list the con that (4) results in the same
problems for Chez, so disregard that conclusion.  The best
approach is far from obvious.  I welcome additional pros
and cons.

--
Alex

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