docs: public static <T> String toSimpleJSON(String tag, T object,
  			JsonObjectWriter<T> writer) throws RedmineInternalError {
  		final StringWriter swriter = new StringWriter();
  		final JSONWriter jsWriter = new JSONWriter(swriter);
  		try {
  			jsWriter.object();
  			jsWriter.key(tag);
  			jsWriter.object();
  			writer.write(jsWriter, object);
  			jsWriter.endObject();
  			jsWriter.endObject();
  		} catch (JSONException e) {
  			throw new RedmineInternalError("Unexpected JSONException", e);
  		}
  
  		return swriter.toString();
  	}