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One thing user needs to notice is how to pass in Serde. The type for consumed struct is Consumed<Windowed<K>, V>, because we need to be able to deserialize struct as windowed key and value; The type for materialized, however, was Materialized<K, V, WindowStore<Bytes, byte[]>> because the window store needs to store raw key instead of windowed key. By strict type enforcement, user would be alerted at compile time if they confuse the two.

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