[zach_garwood]

I remember encountering number 4 in the wild, so I think it deserves to be a genuine "wat". That said, I'm not sure why I (or anyone else) thought I would need to use the identity operator on numbers, but it's certainly a head-scratcher until you dig into the underlying reason.

[owl57]

Maybe such code is written by people scarred by JavaScript and trying to avoid ==. But not sure: I saw this in the wild as well — actually, the victim brought the broken function to chat scratching his head — and he was a quite experienced backend guy (and the experience wasn't in nodejs, AFAIK).

A pretty funny kind of bug, actually: it was some relatively simple function, passing the unit tests but doing some nonsense on real data. Thing is, it was comparing some sequential ids and working perfectly as long as there were no more than 256 objects.