Of course it&#x27;s been posted before, but some quality articles get reposted every so often.  Here&#x27;s a previous discussion:<p><a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=7395045" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=7395045</a>