When you are prototyping you change code here and there, so a type system helps in that regard and I consider type system as a kind of test. So by having that b

When you are prototyping you change code here and there, so a type system helps in that regard and I consider type system as a kind of test. So by having that built in, you need to write less tests, but AFAIK python has an optional type system, not sure how that works, but I suppose it would help in that regard.