[smoe]

Not GP, but I have done plenty of TDD development in dynamic languages and not once have I written a test that checks whether a string is a string. You get that implicitly because others test will fail if the types don't match.

While I personally prefer certain statically typed languages over dynamic ones for new projects, In practice, for small to medium sized projects, runtime type errors is in my opinion much less of an issue as some people make it out to be. Except for null exceptions they rarely make it into production and if, are easy to track down and fix.

Interestingly, a lot of the people I have seen constantly running into type problems in say Python, are the ones coming from statically typed languages that keep insisting doing thing the way they are used to instead of embracing the duck.