I can detect my health is really improving a lot, because I am starting to get back the energy (and thus mental locomotion, intense focus, and clarity) to make research level insights again.

Research level insight first published on Rust’s forum by myself:

https://users.rust-lang.org/t/high-order-function-with-type-parameter/3112/30

(Don't know if anyone else made this point in the prior art, I presume probably yes)

P.S. I doubt Bitcoin core devs can do the above, because programming language typing is not their area of specialization (especially the number theorists/cryptographers). We have different talents and specializations, so we need to learn to respect each other.