The proposed fix has been implemented in open source stacks (yes,
including OpenBSD) for many years, so we're essentially just updating
the specs accordingly (to reflect the real world, and fix the bug).
The IETF's TCPM working group chairs wanted to to some reviews of this
(very short) Internet-Draft before it is adopted as a working group item.
If you have a few minutes, please take a look, and post your
comments/review to <[hidden email]> (and make sure to CC me). This will
be of much help, and having feedback from the implementers' community
would be really valuable.