title: When, if ever, should we use const?
body: <p><code>Const</code> is baked into the client code. <code>Readonly</code> isn't. But <code>const</code> is faster. May be only slightly though.</p>
  
  <p>The question is, is there ever any scenario where you should prefer <code>const</code> over <code>readonly</code>? Or to rephrase, are we not practically <em>always</em> better off using a <code>readonly</code> instead of a <code>const</code> (keeping in mind the above-said baking thing)?</p>