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function byteValue(value) {
var isLittleEndian = new Uint8Array(new Uint16Array([1]).buffer)[0] !== 0;
var ui8 = new Uint8Array(new Float64Array([value]).buffer);
var hex = "0123456789ABCDEF";
var s = "";
for (var i = 0; i < 8; ++i) {
var v = ui8[isLittleEndian ? 7 - i : i];
s += hex[(v >> 4) & 0xf] + hex[v & 0xf];
}
return s;
}
var obj = {};
Object.defineProperty(obj, "prop", {value: NaN});
Object.defineProperty(obj, "prop", {value: -NaN});
assertEq(byteValue(obj.prop), byteValue(NaN));