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Also remember that NaN is represented in multiple ways bitwise:

Also you even have different kinds of NaN (signalling vs quiet)

Per IEEE 754, yes, but JS the language doesn't distinguish between NaN representations.

Correct.

I guess you could actually see what representation your browser is using with ArrayBuffer.

A quiet NaN in my case if I am doing things right:

'0000000000000000111110000111111100000000000000000000000000000000'