title: How does Formatfloat work
body: <p>In this code:</p>
  
  <pre><code>FormatFloat('0.##########',XX.AsFloat)
  </code></pre>
  
  <p>If the value XX in the database is 12.12345, what value will it return?<br>
  The number of # is more than 5 decimal places, so will it do extra rounding?<br>
  I can't find a doc for this <code>FormatFloat</code>.</p>
  
  <p>I'd also like to know what <code>.AsFloat</code> does.</p>