title: .split() by character when string has same character side-by-side
body: <p>Check the following examples and their outcome:</p>
  
  <pre><code>'222'.split('') // ["2", "2", "2"]
  '222'.split('2') // ["", "", "", ""]
  '2a22a'.split('2') // ["", "a", "", "a"]
  </code></pre>
  
  <p>Why is the last example not <code>["", "a", "", "", "a"]</code> ?</p>