code: function ArrayValue(properties) {
                      this.values = [];
                      if (properties)
                          for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
                              if (properties[keys[i]] != null)
                                  this[keys[i]] = properties[keys[i]];
                  }
docs: Properties of an ArrayValue.
  @memberof google.firestore.v1
  @interface IArrayValue
  @property {Array.<google.firestore.v1.IValue>|null} [values] ArrayValue values
   
  Constructs a new ArrayValue.
  @memberof google.firestore.v1
  @classdesc Represents an ArrayValue.
  @implements IArrayValue
  @constructor
  @param {google.firestore.v1.IArrayValue=} [properties] Properties to set