Previous, extensive discussion: <a href="https://news.ycombinator.com/item?id=5592679" rel="nofollow">https://news.ycombinator.com/item?id=5592679</a><p>Also:<p><a href="https://news.ycombinator.com/item?id=5416487" rel="nofollow">https://news.ycombinator.com/item?id=5416487</a><p><a href="https://news.ycombinator.com/item?id=5481441" rel="nofollow">https://news.ycombinator.com/item?id=5481441</a>