PR #1868 introduces a new workflow for proposals. As described in my comment on that PR, I think proposals should evolve through discussion in multiple related issues and pull requests.
To manage this evolution more easily I suggest we create a designated GitHub label for each draft proposal. Apply that label to relevant issues and PRs. Specify that label towards the top of the draft proposal, followed by two links:
- Open issues related to the draft proposal (filtered by label)
- Open pull requests related to the draft proposal (filtered by label)