code: private void register(Class<? extends YamlNode> type, Represent represent) {
          this.representers.put(type, represent);
          this.multiRepresenters.put(type, represent);
      }
docs: Register the {@link Represent} in {@link #representers} and
  {@link #multiRepresenters}.
  
  @param type      the type to register for
  @param represent the represent