Point 1 is how I do it. I think it balances the trade off between too-early abstraction and too-much duplication.
The only thing I'd add is that you should think about including some comments when you duplicate code so that people realise how the different bits of code relate to each other. If you've thought of a potential way to abstract the code, but didn't proceed with it for some reason, you can add a note describing how it could be done. This helps new people understand why they're seeing duplication and how they can factor the code if they choose to.
The only thing I'd add is that you should think about including some comments when you duplicate code so that people realise how the different bits of code relate to each other. If you've thought of a potential way to abstract the code, but didn't proceed with it for some reason, you can add a note describing how it could be done. This helps new people understand why they're seeing duplication and how they can factor the code if they choose to.