https://jspecify.dev/
https://github.com/jspecify/jspecify

https://jspecify.dev/docs/start-here/
https://jspecify.dev/docs/user-guide/

https://jspecify.dev/docs/api/org/jspecify/annotations/package-summary.html

https://jspecify.dev/blog/

2023
nipafx - How Project Valhalla And JSpecify Can Kill NPEs 0:00 of 21:53
    https://www.youtube.com/watch?v=Re5HvyUtIJ0