Scheme Request for Implementation 146,
"Mappings,"
by Marc Nieper-Wißkirchen (with some implementation by Arthur
A. Gleckler),
has gone into "final" status.

The document and an archive of the discussion are available at
<https://srfi.schemers.org/srfi-146/>.

Here's the abstract:

  Mappings are finite sets of associations, where each association
  is a pair consisting of a key and an arbitrary Scheme value. The
  keys are elements of a suitable domain. Each mapping holds no
  more than one association with the same key. The fundamental
  mapping operation is retrieving the value of an association
  stored in the mapping when the key is given.

There were a few changes made to the  implementation since the
last draft, as well as a few trivial changes to the document.
Here's the diff:

  <https://github.com/scheme-requests-for-implementation/srfi-146/compare/fe936f99f489d8df0389e30e84a9b5823fed6fc0...a26c19a30aaa47bd53a7df3dbb3f122352282162>

Many thanks to Marc and to everyone who contributed to the
discussion of this SRFI.

Regards,

SRFI Editor