code: static <A> ISeq<AnyGene<A>> seq(
  		final IntRange lengthRange,
  		final Supplier<? extends A> supplier,
  		final Predicate<? super A> validator
  	) {
  		return MSeq.<AnyGene<A>>ofLength(random.nextInt(lengthRange, getRandom()))
  			.fill(() -> of(supplier.get(), supplier, validator))
  			.toISeq();
  	}
docs: Create gene sequence.