code: function (uuid) {
    uuid = ref.reinterpret(uuid, 16).toString('hex');
    return [
      uuid.slice(0, 8),
      uuid.slice(8, 12),
      uuid.slice(12, 16),
      uuid.slice(16, 20),
      uuid.slice(20, 32)
    ].join('-');
  }
docs: Returns a UUID hex string.
  @param {Array[Byte]} uuid - UUID buffer.
  @return {String} uuid - UUID string.