Pages: StorageDescriptor<
    [
        Enum<
            {
                Aggregate: Enum<
                    { Here: undefined; Parent: undefined; Sibling: number },
                >;
                UnregisterMessageOrigin: undefined;
            },
        >,
        number,
    ],
    {
        first: number;
        first_index: number;
        heap: Binary;
        last: number;
        remaining: number;
        remaining_size: number;
    },
    true,
    never,
>

The map of page indices to pages.