@Override
	public EvolutionStream<G, C>
	stream(final Supplier<EvolutionStart<G, C>> start) {
		return EvolutionStream.ofEvolution(
			() -> evolutionStart(start.get()),
			this
		);
	}
Evaluates the fitness function of the given population with the configured
{@link Evaluator} of this engine and returns a new population
with its fitness value assigned.

@since 5.0

@see Evaluator
@see Evaluator#eval(Seq)

@param population the population to evaluate
@return a new population with assigned fitness values
@throws IllegalStateException if the configured fitness function doesn't
        return a population with the same size as the input population.
        This exception is also thrown if one of the populations
        phenotype has no fitness value assigned.
jenetics/src/main/java/io/jenetics/engine/Engine.java