cck content types with underscores in arguments

This problem is described here: http://groups.drupal.org/node/8566 I also run in to it and manage to add a quick fix for it. However, I'm not sure this is the best way to do it. It could require in other parts also where the module takes the node-type arg from URL.

The bug arrise because: (quote from cck edit form): "The machine-readable name of this content type. This text will be used for constructing the URL of the create content page for this content type. This name may consist of only of lowercase letters, numbers, and underscores. Dashes are not allowed. Underscores will be converted into dashes when constructing the URL of the create content page. This name must be unique to this content type."

so in arguments/node_add.inc line 38. replace

  if (array_filter($conf['types']) && empty($conf['types'][$arg])) {
    return FALSE;
  }

with

   //cck translate '_' in '-' in URLs. Replace them back so we can find them.
  $arg = str_replace('-', '_', $arg);


  if (array_filter($conf['types']) && empty($conf['types'][$arg])) {
    return FALSE;
  }