@Override
    public String toString() {
        return getClass().getSimpleName() + " "
            + Stream.of(values)
                .map(Objects::toString)
                .collect(joining(", ", "{", "}"));
    }
Returns if this Tuple can contain null elements.

@return if this Tuple can contain null elements
common-parent/tuple/src/main/java/com/speedment/common/tuple/internal/BasicAbstractTuple.java