Is this something that started happening recently? I imagine other people would have reacted, in the past, if was always like this? — Maybe there're new employees / interns who didn't think about not touching `_`, and the code review process a bit failed this time?

Here someone reported this to Disqus: https://disqus.com/home/discussion/channel-discussdisqus/bug...

I'm developing an open source Disqus alternative that doesn't overide `_` b.t.w.: https://www.talkyard.io/blog-comments