message: Fix type arg.
diff: @@ -94,7 +94,7 @@ function tcp_unpack(string $data, string $type = 'n'): string
  return 0;
  }
  })($type);
  - return substr($data, $type_length, unpack('n', substr($data, 0, $type_length))[1]);
  + return substr($data, $type_length, unpack($type, substr($data, 0, $type_length))[1]);
  }
  function var_dump_return(...$data): string
  