Now and then, you run into edits to (good) answers like this one. Especially when the answer is "fresh" and you may assume the poster is still around and capable, my opinion is that suggested additions should be done to the poster in a comment, instead of bypassing him or her in an edit. Given these conditions and if the addition is valid, you can be pretty sure it will be integrated in the answer. A good example of how it should be done in my opinion is this one Which is better printf or echo?.
I fully support the idea of collaborating on (the quality of) an answer, but it does not collide with some acknowledgement of authorship in the first stage of an answer (the question is about editing recent answers). I am convinced it serves the quality in general as well, since the poster feels responsible for the answer.
That is why I reject edits to fresh answers usually, but more than once, my fellow reviewers seem to disagree. What is the general idea?