I've just published draft #3 of SRFI 174 based on edits suggested by Lassi Kortela and approved by John Cowan, author of the SRFI.

  https://srfi.schemers.org/srfi-174/

Here are Lassi's comments on the changes:

  These edits clarify the exposition a bit.  They don't change any semantics.

Here is the commit summary:

  - Add missing close parentheses