This article is a follow up to my previous blog post about functional library design, but you do not need to read the previous one, because I'll focus on a different topic. In the previous article, I wrote about a couple of principles that I find useful when designing libraries in a functional style. This follows from my experience with building F# libraries, but the ideas are quite general and can be useful in any programming language. Previously, I wrote how multiple layers of abstraction let you build [...]