values(type, prop) {
    let data = this[type]

    let global = data['*'] && data['*'].values
    let values = data[prop] && data[prop].values

    if (global && values) {
      return utils.uniq(global.concat(values))
    } else {
      return global || values || []
    }
  }
Return values, which must be prefixed in selected property