All bugfixes are incompatibilities

This document summarizes lessons learned from failures in backporting bug fixes to Ruby stable branches: - Don't backport performance improvements or fixes for imaginary use cases as they can introduce regressions. - Be careful backporting fixes related to parsing, constants/method search, and refinements as they are complex and prone to causing new bugs. - Some long-standing bugs may not need fix

[marin72_com]

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[sh19e]

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[Nyoho]

とてもいい基調講演でした。ありがとうございます。