title: f:convertNumber with attribute pattern
body: <p>I'm trying to use following code</p>
  
  <pre><code>&lt;h:inputText id="amount" value="#{bean.amount}"&gt;
      &lt;f:convertNumber pattern="##0.00" /&gt;
  &lt;/h:inputText&gt;
  </code></pre>
  
  <p>I'm expecting this will give error, for numbers with 4-digit integrals. But it happily accepts such numbers, and <strong>does NOT</strong> give conversion error.</p>
  
  <p>Any ideas why?</p>