docs: public <T> T get(String key) {
          if (key.startsWith(PREFIX)) {
              key = key.substring(PREFIX_LEN);
          }
          ConfigKey rk = keyOf(key);
          if (null != rk) {
              return get(rk, null);
          } else {
              return AppConfigKey.helper.getConfiguration(key, null, raw);
          }
      }