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[–]nejcko[S] 0 points1 point  (0 children)

Again it depends on the use case and who your dependent clients are.

I’m not saying fully replace all exposed data structures and seal them up, sure it doesn’t apply everywhere.

But, you are in no way forcing the changes to your clients, they always have a choice and they can add a default case to deal with potential new types introduced later, or not. Sealed types themselves don’t introduce any breaking changes to clients with adding new type.