First paragraph: > Sometimes you run into a situation where you have to extend/improve some existing code. You see that the old code is very lean, but it's als

First paragraph: > Sometimes you run into a situation where you have to extend/improve some existing code. You see that the old code is very lean, but it's also difficult to extend, and takes time to read. Last paragraph: > Is it a good idea to change such code if you have to touch a small piece of it either way?