Can we have a clarification on what is and is not acceptible for discussion in comments?
Based on this question and its responses, I can see it may be policy to redirect extended comment discussions that have got away from the question/answer to chat. Putting aside my particular thoughts on how exactly this could be done, having looked at some of the cited examples, I can see it's a good idea to try to do this.
However, I've just found that a comment I made, specifically on the content of an answer, and two comments refuting it, have been deleted with an admonishment not to "pollute answers with extended discussions". I don't see either how three comments qualifies as "extended", or how commenting specifically on the content of the answer is "side-tracked".
(Of course, since I can't see the comments any more, it's possible that many other comments were made and everything got off-track since I last visited, but... I doubt it.)
If there is a policy on this, can we have it here or in the FAQ?