SheetXL - v1.0.2
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    Type Alias Modifiers

    Modifiers: {
        [K in Exclude<keyof ISparklineGroup.Properties, ColorKey | "rest">]?:
            | ISparklineGroup.Properties[K]
            | null
    } & { [K in ColorKey]?: IColor
    | string
    | null }

    What ISparklineGroup.update and a new group take: any of the Properties, a color as an IColor or a color string, and null to return a property to its default.