I've just published fixes for errata for SRFI 133.  They
have been approved by the author, so I have incorporated
them into the public document and added a note to the Status
section.

Here is original the bug report from Shiro Kawai:

  Date: Sun, 27 Mar 2016 16:57:30 -1000
  From: Shiro Kawai <xxxxxx@gmail.com>
  To: srfi-133@srfi.schemers.org
  Subject: vector-unfold! errata

  vector-unfold! entry reads:

  "Terminates when end-start+1 elements have been generated."

  I believe it's intended to be "end-start elements".  'End'
  is always exclusive, right?
  Then there's no point to generate one extra value and
  discard.

  I guess it can be fixed by errata.

Thank you, Mr. Kawai.

— SRFI Editor