As a counter-argument to the "don't aim for 100%" thing, I would say that code coverage is more important in interpreted (and loosely typed) languages. Particul

As a counter-argument to the "don't aim for 100%" thing, I would say that code coverage is more important in interpreted (and loosely typed) languages. Particularly with preventing regressions. For example, if you change the arity of a function, it's nice to be able to run the tests and see all the calls to it that break.