Understanding implementation details

[Unicode-Hater]

I was trying to read the research paper and after go and look at the implementation details of this library, because of that I wanted to familiarise myself by reading the java code first as it didn't contain a lot of precomputed values, so I was wonder if I could get some formulas, rationale and what not behind the constants used as I want to learn how implant this in a generic way in C++20/23 using template metaprogramming