documentcloud/backbone — pull request #1975 by philfreo (2012-12-19 05:04:03+00:00)
Title: Correcting upgrade guide for collection.fetch({add: true})

The upgrade guide says:

> If you were previously using `collection.fetch({add: true})`, use `{update: true}` now instead.

But having just upgraded myself, I think this isn't really the same thing. The `add` option in `Collection#fetch` used to just add (never remove) newly fetched models to the collection. Use case: think infinity scroll. To get that behavior with `Collection#update` you need to pass the non-default `{ remove: false }` option.