This reminded me of the AngularJS team deciding to go with (optional) runtime type checking over compile-time checking (which is what TypeScript has done to Jav

This reminded me of the AngularJS team deciding to go with (optional) runtime type checking over compile-time checking (which is what TypeScript has done to JavaScript). Their reasoning was that you can use runtime checking for REST responses, which can be argued to somewhat reduce the need for writing tests.