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Hey

That's an interesting perspective. Personally I don't leave lines of commented out code as I opt for cleanliness, but I do keep a journal for each project I do where I write down little gotchas I discover, or paste in a snippet that either works well, or doesn't and the reasons why.

I used to do that (and there are out there many commented lines on old projects that are still active).

Now, I backup the source file somewhere for archive, run multiple tests on the new code, and make an obligation for me to deliver a cleaned source file, with no other comments than the one needed.

It's more clear when you go back to your code to not be distracted by old thoughts.

Usually it ends up distracting me outside of a few days or if it's not my own code. I end up thinking, "why is/was this here? Is it an old implementation? Did it work? Is it a work in progress? Is it the actual implementation and the code next to it a work in progress?"