docs: public static Codec<int[], EnumGene<Integer>> ofPermutation(final int length) {
  		require.positive(length);
  
  		return Codec.of(
  			Genotype.of(PermutationChromosome.ofInteger(length)),
  			gt -> gt.getChromosome().stream()
  				.mapToInt(EnumGene::getAllele)
  				.toArray()
  		);
  	}