a NaN isn't a NaN isn't a NaN

nans.js

function bufferBytes(buffer) {
  return [].map.call(new Uint8Array(buffer), function(x) {return x})
}

function nanBytes(nan) {
  var a = new Float64Array(1);
  a[0] = nan;
  return bufferBytes(a.buffer);
}

var buffer1 = (new Uint8Array([ 0, 0, 0, 0, 0, 0, 248, 127 ])).buffer;
var buffer2 = (new Uint8Array([ 0, 0, 0, 0, 0, 0, 248, 255 ])).buffer;
  
var nan1 = NaN;
var nan2 = Math.sqrt(-1);
var nan3 = (new Float64Array(buffer1))[0];
var nan4 = (new Float64Array(buffer2))[0];

console.log(nanBytes(nan1));
console.log(nanBytes(nan2));
console.log(nanBytes(nan3));
console.log(nanBytes(nan4));

// Firefox:
// [ 0, 0, 0, 0, 0, 0, 248, 127 ]
// [ 0, 0, 0, 0, 0, 0, 248, 255 ]
// [ 0, 0, 0, 0, 0, 0, 248, 127 ]
// [ 0, 0, 0, 0, 0, 0, 248, 127 ]

// Chrome:
// [ 0, 0, 0, 0, 0, 0, 248, 255 ]
// [ 0, 0, 0, 0, 0, 0, 248, 127 ]
// [ 0, 0, 0, 0, 0, 0, 248, 255 ]
// [ 0, 0, 0, 0, 0, 0, 248, 255 ]

Funny timing. nodejs/node-v0.x-archive@61935bc