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SpecialFeatureCount property- now off by default, must be explicitly requested. For detail screen display, apps should not rely on this value and instead just make the api call to get the extras, making sure to handle empty result sets.
People item counts - for example, MovieCount, SeriesCount - apps should not use these anymore and instead just make the call to fetch the items, making sure to handle empty result sets.
IsHD property- deprecated, use Width and/or Height fields.
CollapseBoxSetItems - deprecated in favor of a new property GroupItemsIntoCollections. This should be added directly to the UI for Movies screens. To support older versions of the server, leave your CollapseBoxSetParams as they are for a little while.