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Correctness. Better error handling, persistence, failure-safety. In other words: minimize loses when something fails / prevent failures in the first place.
No due date•1/1 issues closedActual cost improvements / better rm
No due date•0/1 issues closedQuality of life changes
No due date•5/10 issues closedMostly performance / code duplication stuff
No due date•7/12 issues closed