protected static function _determineImplClass(Identifier $identifier): string
    {
        switch ($identifier->typeClass()) {
            case Identifier::CLASS_UNIVERSAL:
                return self::_determineUniversalImplClass($identifier->intTag());
            case Identifier::CLASS_CONTEXT_SPECIFIC:
                return ContextSpecificType::class;
            case Identifier::CLASS_APPLICATION:
                return ApplicationType::class;
            case Identifier::CLASS_PRIVATE:
                return PrivateType::class;
        }
        throw new \UnexpectedValueException(
            sprintf("%s %d not implemented.",
                Identifier::classToName($identifier->typeClass()),
                $identifier->tag()));
    }