Within the demos ‘Add New’ page, in the ‘Validation’ Tab, the ‘File Name’ field’s sanitization rules don’t work! It can’t convert the words to a valid file name. However, it works in ‘Demo Settings’ page.

When I puts my code in wp-content/themes/twentyfourteen/piklist/parts/meta-boxes/field.php

<?php
/*
Title: Validation Fields
Post Type: post
Order: 30
*/
  piklist('field', array(
    'type' => 'text'
    ,'label' => 'File Name'
    ,'field' => 'file_name'
    ,'description' => 'Converts multiple words to a valid file name - by slim'
    ,'sanitize' => array(
      array(
        'type' => 'file_name'
      )
    )
    ,'attributes' => array(
      'class' => 'large-text'
    )
  ));

?>

It shows the meta box in the post edit page, but the sanitization rules don’t work too!

My wordpress version is 4.0.