Maybe someone fat-fingered it?

No, it had more than one downvote when I upvoted it, i.e. stayed grey after upvote. Moreover, I just saw it being black, then grey, then black. So it still receives a mix of downvotes and upvotes. Very strange.

I tried to upvote and it's still grey. There's obviously something wrong in the information, but those who know better aren't taking the time to impart that to us.

If you or someone can't come and point out that 'obviously wrong something' then don't say that just because a comment got downvoted for some bizarre reason. That same comment now has 11 points. I hope it didn't now become 'obviously right' to you just because of the point count. The fact this (going into 'grey' or 'black' with 0 retort or correction given by anyone) even happened is just stupid to me.

I believe nothing I said is wrong and anyone is welcome to prove me wrong. I also answered the original questions/doubts clearly (Is LuaJIT stuck on 5.1 and no longer in development - no and no and there is nothing wrong with 5.1 itself). The only downside could be how brief I was but I gave plenty of keywords ('ints', 'bit ops', 'function environments') for an astute reader to google or look up in the documentation of Lua (which is a Ctrl + F friendly one pager plain HTML with minimal styling and no JS, I have it as a single .html file with inline PNG and css on my desktop to use offline).

This stealthy downvote drama is why I use HN passively, logging in only to do a fire and forget comment. I've just avoided seeing this entire downvote debacle unfold in real time during my normal browsing (and thus avoided wondering what's going on or if I were providing people wrong information or something else wrong on my part, since it's not like any downvoter told us why they did it) because of that habit.