Not allowing negative comment weights results in double-spending problem

[slavicd]

If we don't allow negative comment weights (at least internally - not necessarily for user interface), we run into the following possible situation:

• comment A has weight zero.
• user downvotes A. A still has weight zero, but a downvote is registered per user*comment
• user undoes downvote. A has weight 1.
• user upvotes A. A has weight 2.

[pdewouters]

thanks, I was just looking into this actually - do you want to test this PR? https://github.com/humanmade/comment-popularity/pull/115

[slavicd]

#114 I actually already submitted a PR - except perhaps it's a little bit of a different approach. Yours makes sense too