I've just published draft #3 of SRFI 146.  It was submitted
by Marc Nieper-Wißkirchen, the author of the SRFI.

<http://srfi.schemers.org/srfi-146/>

Here's the diff:

<https://github.com/scheme-requests-for-implementation/srfi-146/pull/2>

Here are Marc's comments about this draft:

- mades fixes according to latest comments on mailing list

- renamed map throughout to mapping (now: SRFI 146:
Mappings)

- fixed order in procedures producing ordered lists (was
reversed)

Regards,

SRFI Editor