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    validator_groups: RuntimeDescriptor<
        [],
        [
            number[][],
            {
                group_rotation_frequency: number;
                now: number;
                session_start_block: number;
            },
        ],
    >

    Returns the validator groups and rotation info localized based on the hypothetical child of a block whose state this is invoked on. Note that now in the GroupRotationInfo should be the successor of the number of the block.