title: Why does webpack includes a Buffer polyfill by default?
body: <p>Webpack docs say that a polyfill for <code>Buffer</code> is included by default (<a href="https://webpack.js.org/configuration/node/#node-buffer" rel="noreferrer">https://webpack.js.org/configuration/node/#node-buffer</a>). </p>
  
  <ol>
  <li><p>Why is it so? </p></li>
  <li><p>Does it make the bundle larger for people who do not need to use <code>Buffer</code>?</p></li>
  </ol>