hook_comment(delete) not invoked when node is deleted

Just noticed that hook_comment(delete) is not invoked for comments related to a node, when this node is deleted.

When a node is deleted, the comment module catches the the event through hook_nodeapi(delete), where this code is executed:

db_query('DELETE FROM {comments} WHERE nid = %d', $node->nid);
db_query('DELETE FROM {node_comment_statistics} WHERE nid = %d', $node->nid);

No other actions are taken. However, when you look at how comments are deleted the flow is:

• _comment_delete_thread() is invoked, which recursively deletes the corresponding comment replies, but that also invokes hook_comment(delete) for each comment.
• Then _comment_update_node_statistics() is also invoked. This is not particulary needed when deleting a node, but anyway...

Not sure how a fix would be best approached, but I would suggest to write a new function in comment module, similar to _comment_delete_thread(), but to recursively delete comments of a node. something like that would easy the task of contrib modules that may need to trigger this kind of operations themselves, such as the spam module or the akismet module (something I'm working on right now and where I noticed this).