+| **scale** | `integer` | optional | Decimal places (integer 0-100). Applies to `number`, `percent`, `rating` and `slider` fields, where it is enforced on writes, and to a `formula` field, whose computed result is rounded to it. REFUSED on a `currency` field — delete it there: a currency amount's decimal places are its currency's, so the currency's ISO 4217 minor unit decides how the amount displays, and a currency write's decimal places stay unconstrained. OMITTED on a `percent` field ⇒ 0 decimal places, so a stored 0.25 reads `25%` on every face; omitted on any OTHER numeric type declares NO fixed width — the value keeps its natural precision, and a DECLARED `scale: 0` (a year, a fiscal period, an ordinal) stays distinguishable from having declared nothing, so nothing is defaulted there. Consumers resolve the effective width by calling `resolveFieldScale` from `@objectstack/spec/data`, the single source for an absent `scale`: a renderer that spells its own fallback is a width no other face can see, and that is how one stored 0.25 came to read `25%` on the read-only cell and `25.00%` in the edit widget. On a `percent` field this is the number of decimal places of the PERCENTAGE-POINT value as displayed and entered — `scale: 2` means 12.34% — and the STORED precision derives from the field's storage scale rather than being declared again: a fraction-stored percent (no `max`, or a `max` at or below 1) stores 12.34% as 0.1234 and is allowed `scale + 2` decimal places at the write seam, while a whole-percent field (`max` above 1) stores the displayed number itself and is allowed exactly `scale`. `number`, `rating` and `slider` are allowed exactly `scale`. The upper bound is the platform's, not a policy: renderers turn `scale` into fraction digits through `toFixed` and `Intl.NumberFormat`'s `maximumFractionDigits`, both of which throw a RangeError above 100 — so a larger declaration is unrenderable by any conforming consumer. |
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