<p>I started work on this last night ;-)</p>
<p>First signs are good and I got to the point where the majority of tests pass - obviously the big blocker there is CPK as you say but also <a href="https://github.com/rails/actionpack-page_caching">https://github.com/rails/actionpack-page_caching</a> (believed to be ready but needs a release, <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="482063430" data-permission-text="Issue title is private" data-url="https://github.com/rails/actionpack-page_caching/issues/58" data-hovercard-type="issue" data-hovercard-url="/rails/actionpack-page_caching/issues/58/hovercard" href="https://github.com/rails/actionpack-page_caching/issues/58">rails/actionpack-page_caching#58</a>) and <a href="https://github.com/rails/record_tag_helper">https://github.com/rails/record_tag_helper</a> (also believed to be ready but needs a release, <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="413817088" data-permission-text="Issue title is private" data-url="https://github.com/rails/record_tag_helper/issues/10" data-hovercard-type="pull_request" data-hovercard-url="/rails/record_tag_helper/pull/10/hovercard?comment_id=523135585&comment_type=issue_comment" href="https://github.com/rails/record_tag_helper/pull/10#issuecomment-523135585">rails/record_tag_helper#10 (comment)</a>).</p>
<p>I think CPK is also reasonable shape - there have been a number rc releases during rails 6 devleopment so it probably just needs finishing off.</p>

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