> NaN === NaN and some NaN !== NaN

In julia NaN === NaN evaluates to true but NaN === -NaN evaluates to false. Of course, NaN == NaN evaluates to false. I think it makes sense that in principle === looks at bit representations, but cannot think of any reason === is useful here, unless you want to encode meaningful stuff inside your NaNs for some reason. It reminded me of this satirical repo [0] discussed also here [1].

[0] https://github.com/si14/stuffed-naan-js [1] https://news.ycombinator.com/item?id=43803724