You shipped a SwiftData app and now want to add a priority field to Todo and clean up existing title values by trimming whitespace. Which change happens automatically, and which one needs VersionedSchema and SchemaMigrationPlan?
Adding an optional field or one with a default value goes through lightweight migration. Changing existing values can't be inferred, so it needs a VersionedSchema and a custom stage in a SchemaMigrationPlan.
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