code: function Resolver(readerType) {
    // Add all fields here so that all resolvers share the same hidden class.
    this._readerType = readerType;
    this._read = null;
    this.itemsType = null;
    this.size = 0;
    this.symbols = null;
    this.valuesType = null;
  }
docs: Resolver to read a writer's schema as a new schema.
  
  @param readerType {Type} The type to convert to.