Notice: Yes, I saw this post. It is not a duplicate since it is no longer accurate.
Take a look at this review (this answer). It has two instances of
While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes.
According to shog, however, the prevention of duplicate form comments is already implemented.
I propose that if this is, somehow, status-bydesign, that duplicate form comments be replaced with upvotes on the first.