default long longValue(final int index) {
		return get(index).allele().longValue();
	}
Return the long value of this {@code NumericChromosome} at the given
{@code index}.

@param index the index of the {@link NumericGene}.
@return the long value of the {@link Gene} with the given {@code index}.
@throws IndexOutOfBoundsException if the index is out of range
        (index &lt; 0 || index &gt;= length()).
jenetics/src/main/java/io/jenetics/NumericChromosome.java