code: @Setup
    @SuppressWarnings({"unchecked", "rawtypes"})
    public void setUp() {
      keys = new Attributes.Key[iterations];
      for (int i = 0; i < iterations; i++) {
        keys[i] = Attributes.Key.create("any");
        withValue = withValue.toBuilder().set(keys[i], "yes").build();
      }
    }
docs: Javadoc.