code: public PeriodConverter[] getPeriodConverters() {
          ConverterSet set = iPeriodConverters;
          PeriodConverter[] converters = new PeriodConverter[set.size()];
          set.copyInto(converters);
          return converters;
      }
docs: Gets a copy of the list of converters.
  
  @return the converters, a copy of the real data, never null