code: public List<V> getValues(String name) {
          List<V> vals = super.get(name);
          if ((vals == null) || vals.isEmpty()) {
              return null;
          }
          return vals;
      }
docs: Get multiple values. Single valued entries are converted to singleton
  lists.
  
  @param name The entry key.
  @return Unmodifieable List of values.