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IEEE 754 specifically prohibits that definition, and JavaScript indeed evaluates `5 <= NaN` to false.

Yep, my memory was incorrect here and I didn't had access to computer, but it is true with `0 <= null`

This is because null coerces to 0 in JS so this is effectively 0 <= 0. NaN is already a `number` so no coercion happens.

Note that == has special rules, so 0 == null does NOT coerce to 0 == 0. If using == null, it only equals undefined and itself.