Spec compliant TodoMVC implementation in Cell.
The entire size of the application is 2.38 kB, which includes cell library
runtime (~1.2 kB). Other reference numbers: react-dom@17.0.2 (39.4 kB),
preact@10.6.4 (4.0 kB), vue@3.2.26 (33.6 kB), etc.