if the sub runs to 20-30 lines, I'd rather have the header
Obviously if it works for you...
However, if it were me and the sub ran to 20-30 lines that I couldn't understand without half a dozen lines of comments I'd refactor it into a larger number of smaller subs - each of which I could understand without half a dozen lines of comments.
I doing code maintenance I tend to ignore comments, since I find that they're out-of-sync with the code half of the time.
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