code: @Expose
      public static String metricPrefix(final Number value, final Locale locale)
      {
          return withinLocale(new Callable<String>()
          {
              public String call() throws Exception
              {
                  return metricPrefix(value);
              }
          }, locale);
      }
docs: <p>
  Same as {@link #metricPrefix(Number)} for the specified locale.
  </p>
  
  @param value
  Number to be converted
  @param locale
  Target locale
  @return The number preceded by the corresponding SI prefix