$type overwritten if passed by reference

I recently discovered an issue where instead of being replaced by the node's title, Pathauto would simply output the string '[title-raw]'. After some extensive debugging, I found that it was because the $type variable sent to hook_token_values was being changed from 'node' to an array of irrelevant information before node_token_values was called. Now, this is also do to the fact that I altered the module_invoke and module_invoke_all functions to pass arguments by reference as described here. Arguments passed by reference is needed by other modules so I could not change it back, so I further debugged to see what function was altering $type. I found it to be the function content_token_values. So, I ended up changing:

      $type = content_types($node->type); //  <-------------------------------------------
      $node->build_mode = 'token';
      $node->content = array();
      content_view($node);
      // The formatted values will only be known after the content has been rendered.
      drupal_render($node->content);
      content_alter($node);

      $field_types = _content_field_types();
      foreach ($type['fields'] as $field) { //  <-------------------------------------------

to simply:

      $types = content_types($node->type); //  <-------------------------------------------
      $node->build_mode = 'token';
      $node->content = array();
      content_view($node);
      // The formatted values will only be known after the content has been rendered.
      drupal_render($node->content);
      content_alter($node);

      $field_types = _content_field_types();
      foreach ($types['fields'] as $field) { //  <-------------------------------------------

This preserved $type to be used by other modules.

I understand that this is a bit convoluted because I pretty much created the problem by forcing variables to passed by reference in the invoke functions, but I find it necessary bring this up somewhere.