In previous discussion of this article, an HN user did the math: pg12 is 16 bytes per NULL and pg13 is 6.32 bytes per NULL. https://news.ycombinator.com/item?

In previous discussion of this article, an HN user did the math: pg12 is 16 bytes per NULL and pg13 is 6.32 bytes per NULL. https://news.ycombinator.com/item?id=25989467 https://news.ycombinator.com/item?id=25989467 So definitely some pretty significant savings there.