docs: public static String joinP(String delimiter, int... values) {
          StringBuilder builder = new StringBuilder(values.length + (delimiter.length() * values.length));
          boolean first = true;
          for (int i : values) {
              if (first) {
                  first = false;
              } else {
                  builder.append(delimiter);
              }
              builder.append(Integer.toString(i));
          }
          return builder.toString();
      }