Writing JavaScript libraries that are stable is hard, too hard. The extreme level of modularity we practice has only made things worse, as it's become very easy to depend on quirks/bugs that exist in other libraries.
The approach that is most often taken to increase stability in a programming language is to introduce Types. That is, trade expressiveness for better static reasoning. The point being, the compiler should be able to find bugs in your program.
I'm interested in another approach; make it easier for the developer to find bugs themselves. To that end, the motivation for this language is to be easy to test. What if everything within a programs closure was available to be mocked.
exports.getName = function(person){