src/third_party/mozjs-45/js/src/jit-test/tests/basic/bug720070.js

var bytes = [0xff, 0xf7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]; // big-endian
bytes.reverse(); // if testing on little-endian
var result = new Float64Array(new Uint8Array(bytes).buffer)[0];

// Check that this doesn't crash
isNaN(result + 0);