All chains
    Preparing search index...
    promote_fast: TxDescriptor<{ to_rank: number; who: SS58String }>

    Fast promotions can skip ranks and ignore the min_promotion_period.

    This is useful for out-of-band promotions, hence it has its own FastPromoteOrigin to be (possibly) more restrictive than PromoteOrigin. Note that the member must already be inducted.