6. Nearly all bugs can be fixed with under 10 lines of code, and quite a few with 1 line. It's always a red flag for me when a fix PR has 200+ lines of code (test case lines of code don't count, neither do comments).
I find the most elegant bug fixes tend to be the ones with an overall reduction of code.
Though, sometimes things are rotten to the core and that net change of -10 lines comes from a +330, -340 diff....
