> For anything of even moderate complexity, only the author will know how it works. I think that's as much true of external dependencies as it is of ones that

> For anything of even moderate complexity, only the author will know how it works. I think that's as much true of external dependencies as it is of ones that you wrote for yourself. With the exception that your own solution is probably smaller, much smaller, because it only ever needed to solve your immediate needs and not everything else a third party had to deal with. So it's quite possible that the internal solution is more approachable when the time comes to debug it.