code: public void put(String keyStr, String value) {
      put(keyStr, StringData.forValue(value));
    }
docs: Puts data into this data tree at the specified key string.
  
  @param keyStr One or more map keys and/or list indices (separated by '.' if multiple parts).
  Indicates the path to the location within this data tree.
  @param value The data to put at the specified location.