code: public List<Excerpt> getAccessorAnnotations() {
      if (accessorAnnotations instanceof ImmutableList) {
        accessorAnnotations = new ArrayList<>(accessorAnnotations);
      }
      return Collections.unmodifiableList(accessorAnnotations);
    }
docs: Returns an unmodifiable view of the list that will be returned by {@link
  org.inferred.freebuilder.processor.property.Property#getAccessorAnnotations()}. Changes to this
  builder will be reflected in the view.