The TSC has discussed and voted in favor of changing the pull request and review process by enabling options provided by Github.
Specifically, we will be enabling an option that will cause new reviewable commits pushed to a pull-request branch to dismiss existing pull request review approvals and asking reviewers to revisit and re-review the new changes since they last reviewed the PR.
For reference, here is the settings screen with the option enabled:
This means that you will be asked to re-review changes when new content is being added to a pull-request. Please continue to provide reviews and keep watching for changes and enhancements added to pull-requests as they evolve.
This change will go into effect immediately.