[kstenerud]

This basically echoes my library building philosophy. The two biggest things are:

1. User-facing complexity: Keep the user interface just big enough to get the job done. Put the "90% of people" interface first and foremost and if you need to cover the other 10%, expose a different interface that's CLEARLY marked "Advanced. You probably don't need to use this". Don't get sucked into chrome plating everything.

2. Internal complexity: Keep your structures simple. Make your functions do one thing and exactly that thing, well. Keep your side effects to a minimum. And keep your dependencies low, because you can't trust that other people have done the same in their libraries.