I've just published draft #2 of SRFI 140.  It was submitted
by Per Bothner, the author.  Among other things, Per has
renamed the SRFI, originally called Strings for WG2, to
Immutable Strings.

  <http://srfi.schemers.org/srfi-140/>

Here's the diff:

  <https://github.com/scheme-requests-for-implementation/srfi-140>

Regards,

SRFI Editor