private static Double[] box(final double... values) {
		final Double[] result = new Double[values.length];
		for (int i = values.length; --i >= 0;) {
			result[i] = values[i];
		}
		return result;
	}
Simplifies {@code this} expression by applying the default
{@link #REWRITER}.

@return a newly created math expression object
jenetics.prog/src/main/java/io/jenetics/prog/op/MathExpr.java