code: @Nullable
    public static Object quoteIfString(@Nullable final Object obj) {
      return obj instanceof String ? StringUtils.quote((String) obj) : obj;
    }
docs: Turn the given Object into a {@code String} with single quotes if it is a {@code String};
  keeping the Object as-is else.
  
  @param obj the input Object (e.g. "myString")
  @return the quoted {@code String} (e.g. "'myString'"), or the input object as-is if not a
  {@code String}