> The title calls it "rare" I believe they are referring to the rarity of hitting this bug during the period of time it was broken, and not the rarity of the b

> The title calls it "rare" I believe they are referring to the rarity of hitting this bug during the period of time it was broken, and not the rarity of the bug in general. People were speculating on this here: https://news.ycombinator.com/item?id=26395138 https://news.ycombinator.com/item?id=26395138, and I even left a comment about this type of bug, but on Node. This category of bug, where session data leaks across requests, is actually incredibly common.