@perspective-dev/viewer
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    NumberFormatStyle:
        | { style: "decimal" }
        | { style: "currency" } & CurrencyNumberFormatStyle
        | { style: "percent" }
        | { style: "unit" } & UnitNumberFormatStyle

    The style family of a numeric column's number_format — serialized FLATTENED into [CustomNumberFormatConfig]'s object, discriminated by the style key ("decimal" default, "currency" + currency/ currencyDisplay/currencySign, "percent", "unit" + unit/ unitDisplay), mirroring Intl.NumberFormat options.