If you're interested in learning from the issue, ask "what's wrong with X?", not "who did X?"

In which case I'd recommend jerf's post at http://www.jerf.org/iri/post/2955, or my comments at https://news.ycombinator.com/item?id=30804253, or even just reasoning a bit from first principles about how intermediate slices would perform given Go's memory/execution model.