as_multi: TxDescriptor<{
    call: TxCallData;
    max_weight: {
        proof_size: bigint;
        ref_time: bigint;
    };
    maybe_timepoint?: {
        height: number;
        index: number;
    };
    other_signatories: SS58String[];
    threshold: number;
}>

See [Pallet::as_multi].