code: public <T> T decode(File file, Class<? extends T> cls)
          throws ParserException, IOException {
  
          return decode(new Reader(file), cls);
      }
docs: Decodes a JSON file into a typed object.
  
  @param file A JSON file to decode.
  @param cls Class for converting.
  
  @return A decoded object.
  
  @throws ParserException
  If an error is occurred while parsing the read data.
  @throws IOException
  If an I/O error is occurred.