[plt-dev] scheme/set

At Mon, 22 Feb 2010 20:39:54 -0500, Carl Eastlund wrote:
> I appreciate the addition of sets to PLT datatypes, but the
> implementation just added to the trunk is very specific to immutable,
> hash table-based sets.  In the spirit of scheme/dict, which allows for
> a variety of more interesting dictionary representations, can we leave
> scheme/set open to other representations of sets?

Does something in the current `scheme/set' API preclude future
extensibility (e.g., adding `prop:set')?