I've just published draft #6 of SRFI 189. It was submitted by John Cowan, co-author of the SRFI. Note that the summary below also includes much work on the sample implementation by co-author Wolfgang Corcoran-Mathe.

John sent these changes in response to Shiro Kawai's comments in the thread with subject "lisp-values->maybe." (Thank you, Shiro.)

Because of this new draft, I've delayed the end of the last-call period a few days.  Please submit your feedback before 2020-06-13.

Here is the commit summary:

Here's the diff:



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