Some NaN stuff

nan.js

/*jshint asi:true */
var print = typeof console === 'undefined' ? print : console.log.bind(console)

var whatnan = function (narray) {
    return [].map.call(new Uint8Array(narray.buffer), function (n) {
        return (n < 16 ? '0' : '') + n.toString(16)
    }).join('')
}

var printnan = function (nan) {
    print(whatnan(new Float64Array([nan])))
}

print(whatnan(new Float64Array([0/0]))) // 000000000000f87f
print(whatnan(new Float64Array([Math.sqrt(-1)]))) // 000000000000f8ff

printnan(0/0)
// 000000000000f8ff (node)
// 000000000000f87f (js)
printnan(Math.sqrt(-1)) // 000000000000f8ff

var a = 0/0
var b = Math.sqrt(-1)

printnan(a)
// 000000000000f8ff (node)
// 000000000000f87f (js)
printnan(b) // 000000000000f8ff

var shouldBeImmutable = Object.freeze(Object.create(null, {
    foo: {
        value: a
    }
}))

printnan(shouldBeImmutable.foo)
// 000000000000f8ff (node)
// 000000000000f87f (js)

Object.defineProperty(shouldBeImmutable, 'foo', {
    value: b
})

printnan(shouldBeImmutable.foo)
// 000000000000f8ff (node)
// 000000000000f87f (js)