code: public void printTo(Appendable appendable, ReadablePartial partial) throws IOException {
          InternalPrinter printer = requirePrinter();
          if (partial == null) {
              throw new IllegalArgumentException("The partial must not be null");
          }
          printer.printTo(appendable, partial, iLocale);
      }
docs: Prints a ReadablePartial.
  <p>
  Neither the override chronology nor the override zone are used
  by this method.
  
  @param appendable  the destination to format to, not null
  @param partial  partial to format
  @since 2.0