Among other things, you need to call this when you receive notifications from the buffer~ for the following scenario:
The buffer~ object is freed
The buffer reference then must be updated to about this event so that it doesn’t do something bad (like try to call into the buffer~ that no longer exists).
In this case you should look at the "sender" parameter to your notify method. You can use an if statement to see which buffer~ it matches and forward as necessary.
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