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#1: Initial revision
When comments were all shown directly under the post with no way to collapse them, it made sense to restrict formatting that could make them take up a lot more vertical space. But (a) we do allow Mathjax (on communities that use it) and (b) comments are now threaded, so I think it makes sense to relax the restrictions. I don't think we want to remove *all* restrictions -- and end up with fleshed-out answer buried in comments where most people will never see them -- but I'm sympathetic to allowing code blocks especially on code-based communities. Does it make sense to limit this beyond the length limit for the comment as a whole? What would be a reasonable balance? (I suppose if somebody uses code formatting to make a 200-line comment just to be cute, a mod would delete the comment and perhaps have a discussion with the author.)