I tend toward 80. Why? Hm, well...
- 72 is much too short when using a 4-char indent level: two levels in and I end up wrapping simple open ... or die "Can't write $filename: $!" calls.
- 78 would be ok, but WHY?
- Anything over 80 seems impolitic; I can always expect that someone can view and edit an 80-column line, but much longer and I fear making a production for someone else to deal with my code.
So, I voted 80, but I'm not strict about it. If I'm maintaining code I try to derive and follow the existing wrapping rules (and other style elements). Some lines just feel like they need to be longer than 80 chars, and I'm willing to let those "break" the wrapping rules.
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