It's human error, but it's not a bug. There's no mistake being made by a human due to faulty thinking or execution. You can have a good faith misunderstanding

It's human error, but it's not a bug. There's no mistake being made by a human due to faulty thinking or execution. You can have a good faith misunderstanding about what an author's intention, especially if your tool does what you want, and it's author decides the lib is headed in a different direction during the next update. Not your fault, not the author's fault, just two different intents.