fix: the id type does not support numbers, when using parallel.

[CorvusYe]

    vertexes.add(
      {
        'id': 3, // Originally, only '3' was supported. After modification, it can now support 3
        'tag': 'tag${r.nextInt(9)}',
        'tags': [
          'tag${r.nextInt(9)}',
          if (r.nextBool()) 'tag${r.nextInt(4)}',
          if (r.nextBool()) 'tag${r.nextInt(8)}'
        ],
        'solid': false,
      },
    );