He mentions funcallable instances in the talk. Here&#x27;s a toy example of such a creature: <a href="https:&#x2F;&#x2F;gist.github.com&#x2F;spacebat&#x2F;a2805737477ab330334edd1361b34dce" rel="nofollow">https:&#x2F;&#x2F;gist.github.com&#x2F;spacebat&#x2F;a2805737477ab330334edd1361b...</a>