I've just published draft #4 of SRFI 142.  It was submitted
by John Cowan, author of SRFI 142.

<https://srfi.schemers.org/srfi-142/>

Here are the diffs:

<https://github.com/scheme-requests-for-implementation/srfi-142/commits/master>

Here are John's comments on the draft:

  As it happens, I just wrapped up the implementation of
  SRFI 142, which is attached along with a revised SRFI.
  Please post these as the Last Call, and ask people to look
  at the code, especially bitwise-other.scm.

  I have also removed `bit-field-append`, which on
  reflection I think is not useful enough: this is the only
  substantive change for this release.

Regards,

SRFI Editor