I've just published draft #2 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:

  Attached is a revision of SRFI 160.  I've written most of the
  first layer and the third layer (see the new Implementation
  section) but there are still a lot of bugs, so I'm not sending
  them yet.

Here's the diff:

  https://github.com/scheme-requests-for-implementation/srfi-160/compare/3fc00ed83023cc7a5d57e3037ba16c87535e5254...4bc0c99718407b88bc8f2cfc6b9e0eae4dff8e76

Regards,

SRFI Editor