Fascinating to see that Elm has removed the Either type with the goal of making code explicit: http://t.co/XrXyiWo65J
Related Posts
Really cute approach to reporting type errors: when there's a type error, show an example of a runtime error that the type check has prevented!
Data-Driven Techniques for Type Error Diagnosis https://escholarship.org/uc/item/59s4h4pv
Playing with optional type signatures in Python, I realise that the return type is the most important to me.
I'd much rather have a function with only a return type instead of a function with only parameter types. It's often quick to add too.
Over a sufficiently long time horizon, all code you write is legacy code.