@Override
	public String toString() {
		return format(
			"%s:\n%s", getClass().getSimpleName(),
			_alterers.stream()
				.map(a -> "   - " + a)
				.collect(Collectors.joining("\n"))
		);
	}
Return the alterers this alterer consists of. The returned array is sealed
and cannot be changed.

@return the alterers this alterer consists of.
jenetics/src/main/java/io/jenetics/CompositeAlterer.java