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    InboundLanes: StorageDescriptor<
        [Key: FixedSizeBinary<4>],
        {
            last_confirmed_nonce: bigint;
            relayers: {
                messages: { begin: bigint; end: bigint };
                relayer: SS58String;
            }[];
            state: Enum<{ Closed: undefined; Opened: undefined }>;
        },
        true,
        never,
    >

    Map of lane id => inbound lane data.