SheetXL - v1.0.2
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    Type Alias PivotSubtotal

    PivotSubtotal:
        | "default"
        | "sum"
        | "countA"
        | "avg"
        | "max"
        | "min"
        | "product"
        | "count"
        | "stdDev"
        | "stdDevP"
        | "var"
        | "varP"

    A subtotal function of a field, as OOXML spells it.