code: function Value(properties) {
                  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 a Value.
  @memberof google.protobuf
  @interface IValue
  @property {google.protobuf.NullValue|null} [nullValue] Value nullValue
  @property {number|null} [numberValue] Value numberValue
  @property {string|null} [stringValue] Value stringValue
  @property {boolean|null} [boolValue] Value boolValue
  @property {google.protobuf.IStruct|null} [structValue] Value structValue
  @property {google.protobuf.IListValue|null} [listValue] Value listValue
   
  Constructs a new Value.
  @memberof google.protobuf
  @classdesc Represents a Value.
  @implements IValue
  @constructor
  @param {google.protobuf.IValue=} [properties] Properties to set