> In Java you can assign any non-primitive typed expression to a variable of type Object. Sure, but if you do this in Java you must use different variable name

> In Java you can assign any non-primitive typed expression to a variable of type Object. Sure, but if you do this in Java you must use different variable names for the reference of type Animal and the reference of type Object. I think algebraic data types and type refinement are great, but I’m not a fan of automagically changing the types of variables in different scopes if it can’t be applied consistently.