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    SignedSubmissionsMap: StorageDescriptor<
        [Key: number],
        {
            call_fee: bigint;
            deposit: bigint;
            raw_solution: {
                round: number;
                score: {
                    minimal_stake: bigint;
                    sum_stake: bigint;
                    sum_stake_squared: bigint;
                };
                solution: {
                    votes1: [number, number][];
                    votes10: [number, FixedSizeArray<9, [number, number]>, number][];
                    votes11: [number, FixedSizeArray<10, [number, number]>, number][];
                    votes12: [number, FixedSizeArray<11, [number, number]>, number][];
                    votes13: [number, FixedSizeArray<12, [number, number]>, number][];
                    votes14: [number, FixedSizeArray<13, [number, number]>, number][];
                    votes15: [number, FixedSizeArray<14, [number, number]>, number][];
                    votes16: [number, FixedSizeArray<15, [number, number]>, number][];
                    votes17: [number, FixedSizeArray<16, [number, number]>, number][];
                    votes18: [number, FixedSizeArray<17, [number, number]>, number][];
                    votes19: [number, FixedSizeArray<18, [number, number]>, number][];
                    votes2: [number, [number, number], number][];
                    votes20: [number, FixedSizeArray<19, [number, number]>, number][];
                    votes21: [number, FixedSizeArray<20, [number, number]>, number][];
                    votes22: [number, FixedSizeArray<21, [number, number]>, number][];
                    votes23: [number, FixedSizeArray<22, [number, number]>, number][];
                    votes24: [number, FixedSizeArray<23, [number, number]>, number][];
                    votes3: [number, FixedSizeArray<2, [number, number]>, number][];
                    votes4: [number, FixedSizeArray<3, [number, number]>, number][];
                    votes5: [number, FixedSizeArray<4, [number, number]>, number][];
                    votes6: [number, FixedSizeArray<5, [number, number]>, number][];
                    votes7: [number, FixedSizeArray<6, [number, number]>, number][];
                    votes8: [number, FixedSizeArray<7, [number, number]>, number][];
                    votes9: [number, FixedSizeArray<8, [number, number]>, number][];
                };
            };
            who: SS58String;
        },
        true,
        never,
    >

    Unchecked, signed solutions.

    Together with SubmissionIndices, this stores a bounded set of SignedSubmissions while allowing us to keep only a single one in memory at a time.

    Twox note: the key of the map is an auto-incrementing index which users cannot inspect or affect; we shouldn't need a cryptographically secure hasher.