For my personal work, I treat GPLv3 (and similarly licensed) projects as essentially the same as anything behind a commercial license -- they don't exist.
Rather than thinking about how to re-implement a thing that doesn't exist, I think about how to implement the tool I actually need. What I end up with may be less general, but it's actual functionality is often simpler and easier for me to grok/remember.
Rather than thinking about how to re-implement a thing that doesn't exist, I think about how to implement the tool I actually need. What I end up with may be less general, but it's actual functionality is often simpler and easier for me to grok/remember.