- Kevin Gibbons
- Allen Wirfs-Brock
- Leo Balter
This proposal is currently stage 1 of the TC39 process.
https://twitter.com/BrendanEich/status/771009446298329088
https://github.com/tc39/proposal-setmap-offrom/issues
A polyfill is available in the core-js library. You can find it in the ECMAScript proposals section.