title: Array to string conversion, with split
body: <p>I have a text like: 000325175
  and I want to format it as: 000 325 175.</p>
  
  <p>Nothing's easier (in theory) with the split filter, as:</p>
  
  <pre><code>{{ mynumber|split('', 3) }}
  </code></pre>
  
  <p>But I get a</p>
  
  <pre><code>An exception has been thrown during the rendering of a template ("Notice: Array to string conversion")
  </code></pre>
  
  <p>However I can apply a slice filter without any problem.</p>
  
  <pre><code>{{ mynumber|slice(9, 14) }}
  </code></pre>
  
  <p>So I don't understand. Thanks for help</p>