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    Type Alias NextSessionChangesValidators

    NextSessionChangesValidators: StorageDescriptor<[], number, true, never>

    A storage value that is set when a new_session gives a new validator set to the session pallet, and is cleared on the next call.

    The inner u32 is the id of the said activated validator set. While not relevant here, good to know this is the planning era index of staking-async on AH.

    Once cleared, we know a validator set has been activated, and therefore we can send a timestamp to AH.