code: public static IntegerGene of(final IntRange range) {
  		return of(nextInt(getRandom(), range.getMin(), range.getMax()), range);
  	}
docs: Create a new random {@code IntegerGene}. It is guaranteed that the value of
  the {@code IntegerGene} lies in the interval [min, max].
  
  @since 3.2
  
  @param range the integer range to use
  @return a new random {@code IntegerGene}
  @throws NullPointerException if the given {@code range} is {@code null}.