DERGeneralString derRealm = ASN1Util.as(DERGeneralString.class, tagged);
                this.userRealm = derRealm.getString();
                break;
            case 3: // Principal
                ASN1Sequence principalSequence = ASN1Util.as(ASN1Sequence.class, tagged);
                ASN1Sequence nameSequence = ASN1Util.as(ASN1Sequence.class, ASN1Util.as(ASN1TaggedObject.class, principalSequence, 1));

        ASN1Sequence seq = new DERSequence(v);

        // Act + Assert
        // Note: The actual error will be from ASN1Util.as() trying to cast to ASN1TaggedObject
        assertThrows(PACDecodingException.class, () -> new KerberosApRequest(seq, null));
    }

    @Test
    @DisplayName("seq ctor: tag 3 APPLICATION triggers ticket parsing")