There's a 4th that I find is, at the very least, incredibly useful for mentoring and knowledge sharing: Comments to the effect of, "Did you know about this othe

There's a 4th that I find is, at the very least, incredibly useful for mentoring and knowledge sharing: Comments to the effect of, "Did you know about this other way to do that? It would have X effect." With a clear understanding that it is up to the person submitting the code review to decide whether or not to make the change. 'Cuz, I agree, arguing about stylistic things after-the-fact tends to do more harm than good.