Pages: StorageDescriptor<
    [
        Enum<
            {
                Here: undefined;
                Parent: undefined;
                Sibling: number;
                Snowbridge: FixedSizeBinary<32>;
            },
        >,
        number,
    ],
    {
        first: number;
        first_index: number;
        heap: Binary;
        last: number;
        remaining: number;
        remaining_size: number;
    },
    true,
    never,
>

The map of page indices to pages.