code: public static ArgumentValidator inRange(int expectedMin, int expectedMax) {
          return inRange(expectedMin, expectedMax, MessageFormat.format("{0}..{1}",expectedMin, expectedMax));
      }
docs: Creates a {@link ArgumentValidator} which checks for _expectedMin <= #arguments <= expectedMax_.
  
  @param expectedMin the minimum number of expected arguments
  @param expectedMax the maximum number of expected arguments
  @return an ArgumentValidator