Ideally if it's a library you just need to know how to use it, not how it works internally right? Maybe that's too optimistic, but that's certainly how I use libraries in C++.
That's not even the case in C++ (I find myself having to step through Boost and even the standard library once in a while) but it's about 10x worse in a language that has so little static verification. If you use the library wrong then you find out via a runtime error you'll have to track down. Instead of, say, a type checker complaining about the type mismatch of your template parameter.
