On Sun, Jul 2, 2017 at 2:22 PM, John Cowan <xxxxxx@ccil.org> wrote:

They only appear to be the same API, because although there are comparators that can be used with both types of mappings, there are also comparators that are specific to one kind or another.

Yes, but the significant portion of these APIs are overlapping, and if they were generic, one could write wide variety of

generic procedure using mappings without concerning their concrete implementation.

But such polymorphic interface is beyond the current srfi's scope, I agree.