When submitting a node edit form, hook_nodeapi's $node->taxonomy has completely different structure than when doing a node_save

When submitting a form, hook_nodeapi shows $node->taxonomy as something like this...

array
  1 => // 1 is the vid
    array
      177 => string '177' (length=3)

But when doing a node_save() it is like this...

array
  177 => 
    object(stdClass)[20]
      public 'tid' => string '177' (length=3)
      public 'vid' => string '1' (length=1)
      public 'name' => string 'Test' (length=4)
      ...

This completely screws up contrib modules like NAT when doing a node_save(). The problem is in node_form_submit just pushing form_values into the node object. Really we need to process these form values (kinda like CCK does) before getting back our internal representation of a node. I think the latter should be what is sent to hook_nodeapi. Sadly, this has to wait until D7 I suppose and may require some major refactoring so I don't have a patch yet. I'm thinking we should add a 'submit' op in taxonomy_nodeapi to change the form_values into the node object.

Any thoughts before I submit a patch?