The spec for this action:
https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#G11.2111850
An example of a form using this action:
https://www2.illinois.gov/rev/forms/reg/Documents/reg-1-mr.pdf
NumCopies: Number.isInteger,
    };
    const obj = this._catDict.get("ViewerPreferences");
    let prefs = null;
    if (isDict(obj)) {
      for (const key in ViewerPreferencesValidators) {
        if (!obj.has(key)) {
          continue;
        }
        const value = obj.get(key);
        
        if (!ViewerPreferencesValidators[key](value)) {
          info(`Bad value in ViewerPreferences for "${key}".`);
          continue;
        }
        let prefValue;
        switch (key) {
          case "NonFullScreenPageMode":
            switch (value.name) {
              case "UseNone":
              case "UseOutlines":
              case "UseThumbs":
              case "UseOC":
                prefValue = value.name;
                break;
              default:
                prefValue = "UseNone";
            }
            break;
          case "Direction":