In !lurk, you do lurkCount = lurkers.length; but not in !unlurk. I’d recommend removing lurkCount, if possible, and relying on lurkers.length to be correct (which it will be).
In !lurk, you do lurkCount = lurkers.length; but not in !unlurk. I’d recommend removing lurkCount, if possible, and relying on lurkers.length to be correct (which it will be).