code: function lengthInBytes(type) {
    switch(type) {
      case TYPE_UNKNOWN:
        return LENGTH_UNKNOWN;
      case TYPE_EUI64:
        return LENGTH_EUI64;
      case TYPE_EUI48:
        return LENGTH_EUI48;
      case TYPE_RND48:
        return LENGTH_RND48;
      default:
        return null;
    }
  }
docs: Return the length in bytes of the given identifier type.
  @param {Number} identifier The given identifier type.
  @return {Number} The length of the identifier in bytes.