title: Number.isNaN('asd') === false in Node.js! What gives?
body: <p>Try it: In Node.js, or Firefox, open a REPL, and type:</p>
  
  <pre><code>Number.isNaN('asdf');
  </code></pre>
  
  <p>How can this not be <code>NaN</code>? What is <code>NaN</code> if not this?</p>