docs: protected String getRFC822EmailAddress(final Collection<List<?>> subjectAltNames) {
          if (subjectAltNames == null) {
              return null;
          }
          Optional<List<?>> email = subjectAltNames
              .stream()
              .filter(s -> s.size() == 2 && (Integer) s.get(0) == SAN_RFC822_EMAIL_TYPE)
              .findFirst();
          return email.map(objects -> (String) objects.get(1)).orElse(null);
      }