Scheme Request for Implementation 218,
by John Cowan (text) and Arvydas Silanskas (implementation),
has gone into withdrawn status.
The document and an archive of the discussion are available at https://srfi.schemers.org/srfi-218/.
Here is John's summary of the reasons for withdrawal:
Here is the commit summary since the most recent draft:
Thanks to John and Arvydas for their work on this SRFI, and to our reviewers for their comments.