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    QueuedSolutionBackings: StorageDescriptor<
        FixedSizeArray<2, number>,
        [SS58String, { backers: number; total: bigint }][],
        true,
        never,
    >

    The (amount, count) of backings, divided per page.

    This is stored because in the last block of verification we need them to compute the score, and check MaxBackersPerWinnerFinal.

    This can only ever live for the invalid variant of the solution. Once it is valid, we don't need this information anymore; the score is already computed once in [QueuedSolutionScore], and the backing counts are checked.