VersionDiscoveryQueue: StorageDescriptor<
    [],
    [
        Enum<
            {
                V3: { interior: XcmV3Junctions; parents: number };
                V4: { interior: XcmV3Junctions; parents: number };
                V5: {
                    interior: Enum<
                        {
                            Here: undefined;
                            X1: Enum<
                                {
                                    AccountId32: { id: ...; network?: ... };
                                    AccountIndex64: { index: ...; network?: ... };
                                    AccountKey20: { key: ...; network?: ... };
                                    GeneralIndex: bigint;
                                    GeneralKey: { data: ...; length: ... };
                                    GlobalConsensus: Enum<(...)>;
                                    OnlyChild: undefined;
                                    PalletInstance: number;
                                    Parachain: number;
                                    Plurality: { id: ...; part: ... };
                                },
                            >;
                            X2: FixedSizeArray<
                                2,
                                Enum<
                                    {
                                        AccountId32: ...;
                                        AccountIndex64: ...;
                                        AccountKey20: ...;
                                        GeneralIndex: ...;
                                        GeneralKey: ...;
                                        GlobalConsensus: ...;
                                        OnlyChild: ...;
                                        PalletInstance: ...;
                                        Parachain: ...;
                                        Plurality: ...;
                                    },
                                >,
                            >;
                            X3: FixedSizeArray<
                                3,
                                Enum<
                                    {
                                        AccountId32: ...;
                                        AccountIndex64: ...;
                                        AccountKey20: ...;
                                        GeneralIndex: ...;
                                        GeneralKey: ...;
                                        GlobalConsensus: ...;
                                        OnlyChild: ...;
                                        PalletInstance: ...;
                                        Parachain: ...;
                                        Plurality: ...;
                                    },
                                >,
                            >;
                            X4: FixedSizeArray<
                                4,
                                Enum<
                                    {
                                        AccountId32: ...;
                                        AccountIndex64: ...;
                                        AccountKey20: ...;
                                        GeneralIndex: ...;
                                        GeneralKey: ...;
                                        GlobalConsensus: ...;
                                        OnlyChild: ...;
                                        PalletInstance: ...;
                                        Parachain: ...;
                                        Plurality: ...;
                                    },
                                >,
                            >;
                            X5: FixedSizeArray<
                                5,
                                Enum<
                                    {
                                        AccountId32: ...;
                                        AccountIndex64: ...;
                                        AccountKey20: ...;
                                        GeneralIndex: ...;
                                        GeneralKey: ...;
                                        GlobalConsensus: ...;
                                        OnlyChild: ...;
                                        PalletInstance: ...;
                                        Parachain: ...;
                                        Plurality: ...;
                                    },
                                >,
                            >;
                            X6: FixedSizeArray<
                                6,
                                Enum<
                                    {
                                        AccountId32: ...;
                                        AccountIndex64: ...;
                                        AccountKey20: ...;
                                        GeneralIndex: ...;
                                        GeneralKey: ...;
                                        GlobalConsensus: ...;
                                        OnlyChild: ...;
                                        PalletInstance: ...;
                                        Parachain: ...;
                                        Plurality: ...;
                                    },
                                >,
                            >;
                            X7: FixedSizeArray<
                                7,
                                Enum<
                                    {
                                        AccountId32: ...;
                                        AccountIndex64: ...;
                                        AccountKey20: ...;
                                        GeneralIndex: ...;
                                        GeneralKey: ...;
                                        GlobalConsensus: ...;
                                        OnlyChild: ...;
                                        PalletInstance: ...;
                                        Parachain: ...;
                                        Plurality: ...;
                                    },
                                >,
                            >;
                            X8: FixedSizeArray<
                                8,
                                Enum<
                                    {
                                        AccountId32: ...;
                                        AccountIndex64: ...;
                                        AccountKey20: ...;
                                        GeneralIndex: ...;
                                        GeneralKey: ...;
                                        GlobalConsensus: ...;
                                        OnlyChild: ...;
                                        PalletInstance: ...;
                                        Parachain: ...;
                                        Plurality: ...;
                                    },
                                >,
                            >;
                        },
                    >;
                    parents: number;
                };
            },
        >,
        number,
    ][],
    false,
    never,
>

Destinations whose latest XCM version we would like to know. Duplicates not allowed, and the u32 counter is the number of times that a send to the destination has been attempted, which is used as a prioritization.