Why avoid subtyping?

Question

I have seen many people in the Scala community advise on avoiding subtyping \"like a plague\". What are the various reasons against the use of subtyping? What are the altern

Answer 1

This is the best paper I have found on the subject. A motivating quote from the paper –

We argue that while some of the simpler aspects of object-oriented languages are compatible with ML, adding a full-fledged class-based object system to ML leads to an excessively complex type system and relatively little expressive gain