Interface ToStringRoundingOptionsWithFractionalSeconds<Units>

interface ToStringRoundingOptionsWithFractionalSeconds<
    Units extends DateUnit
    | TimeUnit,
> {
    fractionalSecondDigits?: 0 | 1 | 3 | 4 | 2 | 5 | "auto" | 8 | 6 | 7 | 9;
    roundingMode?:
        | "floor"
        | "trunc"
        | "ceil"
        | "expand"
        | "halfCeil"
        | "halfFloor"
        | "halfExpand"
        | "halfTrunc"
        | "halfEven";
    smallestUnit?: PluralizeUnit<Units>;
}