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Marc-André Bombeck
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Apple stamps every quantity `<Record>` of an export archive with the account's own display unit, not the unit the mapping table assumes: a metric archive reports walking distance in km, an imperial one in mi, body mass in lb, energy in kJ, temperature in degF. The mapper accepted `input.unit` and never read it, so a 2.484 km day was folded into the day's total as 2.484 m and a decade of imported history read as a couple of metres walked. `hk-units.ts` is now the one place a HealthKit unit is converted, shared by the record path and the workout path (which carried its own km/mi branch — the duplicate is what let the record path stay wrong). It converts only inside a family and only for units Apple can emit, and returns the reading untouched for anything it cannot place, so an archive that already speaks the table's unit is unchanged. Every mapping-table entry whose unit cannot be converted — a dimensionless count, a pinned event, a logarithmic dB level, a compound rate, the percent units whose value rides as a 0..1 fraction — now carries a written reason, and a structural guard fails on an entry that offers neither a convertible unit nor a reason. Refs #944