It's typically written up in meeting notes and someone publishes them if it happens during a meeting. If it happens outside of a meeting it likely happened in G

It's typically written up in meeting notes and someone publishes them if it happens during a meeting. If it happens outside of a meeting it likely happened in GitHub or the ECMAScript mailing list. The person(s) opposing have likely already shared their view point with the community at different stages. Proposals are not simply created and championed with zero feedback from the ECMAScript folks util they're proposed at a meeting.