code: @SuppressWarnings("UnusedReturnValue")
      public StatList add(int integer) {
          if (end + 1 >= values.length) {
              values = Lng.grow(values);
          }
          values[end] = integer;
          end++;
          return this;
      }
docs: Add a new value to the list but don't employ a wrapper.
  
  @param integer new value
  @return was able to add.