I've just published draft #9 of SRFI 160.  It was submitted by
John Cowan, author of the SRFI.

  <https://srfi.schemers.org/srfi-160/>

Here are John's comments on the draft:

  This change renames the (srfi x4) library, which was exposed
  only because R7RS doesn't have truly private libraries, to (r6rs
  160 base), which is now fully documented.  H/t Alex Shinn for
  this suggestion.  In addition I have limited the scope of the
  implementation to R7RS systems only, although porting should be
  trivial to any system that supports SRFI 4.  For a highly
  portable implementation of SRFI 4, see the contrib/cowan
  directory of the SRFI 4 repo.  An implementation of (r6rs
  bytevectors) also appears there for non-R6RS systems. The
  implementation of (srfi 160 base) passes its tests: the
  implementation of the other libraries does not as yet.

Here's the diff:

  <https://github.com/scheme-requests-for-implementation/srfi-160/compare/81abebb85a4008506c8185955cfd6e03638fb50d...4451b576f8d0a80372675e48acf10c719256f045>

Regards,

SRFI Editor