code: public static Tag<String> tagValueToString(Tag<?> tag) {
      return new Tag<>(tag.getKey(), tag.getValue().toString());
    }
docs: Converts a wildcard {@link Tag} to a {@link String} {@link Tag}. This method uses the {@link Object#toString()}
  method to convert the wildcard type to a {@link String}.
  
  @param tag a {@link Tag} that should be converted to a {@link Tag} with value of type {@link String}
  
  @return a {@link Tag} with a {@link String} value