Funnily enough, I made something similar a couple of months ago, not as a replacement for a "nothing" value but as a quick-and-dirty object placeholder and blac

Funnily enough, I made something similar a couple of months ago, not as a replacement for a "nothing" value but as a quick-and-dirty object placeholder and black box for tracking function calls. https://github.com/UQ-eLIPSE/kuro https://github.com/UQ-eLIPSE/kuro