I&#x27;ve done some thinking on what makes sense and ended up at this very rough first sketch. Comments welcome.<p><a href="https:&#x2F;&#x2F;gist.github.com&#x2F;hlandau&#x2F;ed6a96150c69945143be" rel="nofollow">https:&#x2F;&#x2F;gist.github.com&#x2F;hlandau&#x2F;ed6a96150c69945143be</a>