Coherence and orphan instance rules

This blog post delves into the concepts of typeclasses, coherence, and orphan instance rules in programming languages such as Rust and Haskell. It explains how typeclasses enable polymorphism through method overloading and the importance of coherence in ensuring that the same method calls behave consistently across different parts of a program. The author discusses implications of overlapping instances and the need for rules to maintain coherence when composing libraries, highlighting the significance of orphan instance rules. The post suggests a potential area for further research on formalizing these rules and ensuring globally coherent systems.