TypeToken<?> convertFromType = type.resolveType(Converter.class.getTypeParameters()[0]);
      TypeToken<?> convertToType = type.resolveType(Converter.class.getTypeParameters()[1]);
      @SuppressWarnings("unchecked") // returns default for both F and T
      T defaultConverter = (T) defaultConverter(convertFromType, convertToType);
      return defaultConverter;
    }
    if (type.getRawType().isInterface()) {

	return nil, fmt.Errorf("type conversion error from '%s' to '%v'", a.typeValue.String(), typeDesc)
}

// ConvertToType implements ref.Val.ConvertToType.
func (a receiverOnlyObjectVal) ConvertToType(typeVal ref.Type) ref.Val {
	switch typeVal {
	case a.typeValue:
		return a
	case types.TypeType:
		return a.typeValue
	}

	return nil, fmt.Errorf("type conversion to '%s' not supported for values preserved by x-kubernetes-preserve-unknown-fields", refType)
}

func (t *unknownPreserved) ConvertToType(typeValue ref.Type) ref.Val {
	return types.NewErr("type conversion to '%s' not supported for values preserved by x-kubernetes-preserve-unknown-fields", typeValue.TypeName())
}