Upgrading a SharePoint list instance that was deployed via feature?

In my experience, the schema of the list instance will be upgraded most of the time. But if you have made manual customizations to the content type instance or to the list instance's fields, that can break inheritance to the site content type and the list definition resulting in the schema changes not being passed to the list instance. However, even in this latter case, changes to the event receiver will still be picked up by the list instance.

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