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The idea for this talk came to me when I was looking for a Haskell library for JWT. I wasn't completely satisfied with interfaces like
HashMap Text Value, so I decided to write something myself. It eventually took the form of libjwt-typed library.
It turned out that I had to explore many things that I wanted to share with other Haskell enthusiasts:
- type families
- “open product" types
- GHC rewrite rules
I think that this material can serve well as a cheat-sheet. In the course of this talk, I'll try to present how these (sometimes not widely known) techniques can be applied to solve well-defined domain-modelling problems. But more importantly, I'll try to convince the audience that seemingly “complicated" Haskell is not so difficult at all, and can bring tangible benefits. Despite what SimpleHaskell advocates say: the library turns out to be many times faster than contenders, while giving the user a more enjoyable, less error-prone interface to work with.
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