Add Support for Core Number Field

Just wanted to know if there was a specific reason why this modules supports the text and image fields, but not the core number field. I wanted to add Microdata for the prepTime and cookTime properties as specified at http://schema.org/Recipe and was using a number_integer field. I wrote a simple hook_field_info_alter to add support for this field type and it seems to be working just fine:

/** 
 * Implements hook_field_info_alter().
 */
finction d7dev_filed_info_alter(&$info) {
  $info['number_integer']['microdata']=TRUE;
}

I would be happy submit a patch if this is a desired feature.