I've just published draft #8 of SRFI 181. It was submitted by John Cowan, co-author of the SRFI.
Here are John's comments on the draft:
…added the new Implementation section on positioning and peeking.
Here is the commit summary:
Here's the diff:
https://github.com/scheme-requests-for-implementation/srfi-181/compare/draft-7..draft-8
Regards,
SRFI Editor