default EvolutionStart<G, C> before(final EvolutionStart<G, C> start) {
		return start;
	}
This method is called right before the evaluation of a generation is
started.

@param start the evolution start object
@return the possible <em>update</em> evolution start object
@throws NullPointerException if the evolution {@code start} object is
        {@code null}
jenetics/src/main/java/io/jenetics/engine/EvolutionInterceptor.java