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    Type Alias HrmpChannelContents

    HrmpChannelContents: StorageDescriptor<
        [Key: { recipient: number; sender: number }],
        { data: Binary; sent_at: number }[],
        false,
        never,
    >

    Storage for the messages for each channel. Invariant: cannot be non-empty if the corresponding channel in HrmpChannels is None.

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