I've pushed Bradley's draft #6 for SRFI 122:

---------- Forwarded message ----------
Date: Sun, Oct 18, 2015 at 8:36 PM
Subject: [srfi-122] Changes to simplify SRFI (#5)

I made a number of changes basically to simplify the API of this SRFI. In so doing, I removed some flexibility, but the people on the mail list seemed to think that the added complexity wasn't worth it.

See the commit messages for this pull request for more specific information.

Brad Lucier

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