// TODO: if we want to support more than one value-filler or a value-filler in conjunction with
// the FunctionValues, then members like "scorer" should be per ValueFiller instance.
// Or we can say that the user should just instantiate multiple FunctionValues.
//
return new ValueFiller() {
private final MutableValueFloat mval = new MutableValueFloat();
@Override
public MutableValue getValue() {
return mval;
}