This is why I often favor objects over records for mutable data. With objects, I can hide what is stored and provide methods for all three values. The user of the object doesn’t need to know or care which is stored and which is calculated. This encapsulation also helps with renaming: I can rename the field while providing methods for both the new and the old names, gradually updating callers until they are all done. I just said I favor objects for mutable data. If I have an immutable value, I can just have all three values in my record, using an enrichment step if necessary. Similarly, it’s
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