Discussed in 2015 (not very well) https://news.ycombinator.com/item?id=9091997
Discussed at the time (much better): https://news.ycombinator.com/item?id=5438679
Related from last year: https://news.ycombinator.com/item?id=20895212
Related bit from 2018: https://news.ycombinator.com/item?id=18765224
Discussed in 2015 (not very well) https://news.ycombinator.com/item?id=9091997
Discussed at the time (much better): https://news.ycombinator.com/item?id=5438679
Related from last year: https://news.ycombinator.com/item?id=20895212
Related bit from 2018: https://news.ycombinator.com/item?id=18765224