> You have a point.
>
> >This is especially important for maintenance of the resulting
> >system.  Especially as Scheme systems start (and continue) to offer
> >compiled modules, programmers or sysadmins may want to upgrade package
> >Foo.  If Foo changes its selection of the underlying set collection, it
> >would be onerous to require all packages that depend on it to be
> >modified at the source code level to remain compatible.
> >
> Yes - but isn't it the role of the module system to take care of that?

If its a sophisticated enough module system, then probably.  But as we
aren't specifying module system functionality in this SRFI, we don't
have that luxury, as you point out.

	Scott