My point was that without a type system you need an impossible 100% code coverage, to be sure that you didn't accidentally mess up some variable assignment or parameter somewhere, since you have nothings to easily and automatically catch those errors.

A quick check everytime when you build / package the code is surely more effective than a human code review.

Also the difficulty of coding in a language where there isn't any static type analysis still remains. How does it even work, do you have to do a manual text search everytime you change some existing function or class?

Nonsense. The compiler can handle type-checking far more quickly and acurately than any code reviewer. When I review code, I want to look at code structure, algorithms, data structures, interface design, contracts, logic, and style.

I don't want to go through your code line by line cross-referencing every function call to make sure you put the arguments in the right order and checking every member access for typos. That's a waste of my time, and by extension, the company's money.