It's still interesting to have a feel as to the point at which you have to drop out of idiomatic code. Generally there is a complexity cost associated with per

It's still interesting to have a feel as to the point at which you have to drop out of idiomatic code. Generally there is a complexity cost associated with performance tuning so there's value in avoiding it if possible. Whether or not that value trumps other factors e.g. convenience, expressivity will depend on your usage but I think it's a useful data point.