Function aggregate_custom 

pub fn aggregate_custom<C>(
    signing_package: &SigningPackage<C>,
    signature_shares: &BTreeMap<Identifier<C>, SignatureShare<C>>,
    pubkeys: &PublicKeyPackage<C>,
    cheater_detection: CheaterDetection,
) -> Result<Signature<C>, Error<C>>
where
    C: Ciphersuite,

Like aggregate(), but allow specifying a specific cheater detection strategy. If you are disabling cheater detection, then the identifiers in signature_shares do not need to correspond to the senders (i.e. you don’t need to authenticate the origin of the shares).