One of the things I see software developers often talking about is how they refactor code. As they touch a class, method, etc., they may take the time to refactor the code to make it cleaner, perform better, or just add some documentation. It seems that a regular part of a software developer's job is refactoring code in the codebase.
That is unless they see a "don't touch this, no idea how it works" comment. There are plenty of those, and often everyone leaves that code alone.
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