> If that's too difficult, then it's better to eliminate the isomorphism,
> which effectively means no dispatching on primitive types. And without
> them, SRFI-44 has no concrete collections at all. With no concrete
> collections and no defined method for dispatch, all that's left is
> vapor.

You're so dramatic Bradd.  You can very well have concrete types
in SRFI-44, its just that trying to wedge the non-collection types from
Scheme in that causes problems.