A NaN Edge Case

[flash2015]

I think I may have figured out how to reproduce the NaN scenario I saw before. Here is how to do it:

(1) Open two windows to the same Forum thread in the same browser.
(2) In the first thread +1 a comment which has no +1s.
(3) In the second thread, without refreshing the page (i.e. it still shows just + for the comment), +1 the same comment. You should now see a +NaN, click the + sign again and it will change into a +1.

I think I have also been able to make it show +2 with the two windows simultaneously but I haven't figured out how to reproduce it yet (give me another year to figure it out :) ).

This is in Firefox 69.0 on Windows 8.1. It isn't a big deal as it is unlikely that many people will hit it but thought you should know...and hopefully this clears up the idea that I would purposely go out of my way to waste anyone's time.