TypeError: 'File' object does not support item assignment

[gingerbeardman]

Error

Traceback (most recent call last):
  File "/Volumes/External/Users/matt/CD-ROMs/./dumper-companion.py", line 518, in <module>
    exit(args.func(args))
  File "/Volumes/External/Users/matt/CD-ROMs/./dumper-companion.py", line 302, in extract_volume
    vol.read(source_volume.read_bytes())
  File "/usr/local/lib/python3.9/site-packages/machfs/main.py", line 299, in read
    parent_obj[child_name] = child_obj
TypeError: 'File' object does not support item assignment

Notes

• I'm using machfs via SCUMMVM's dumper-companion.py, forgive me if this is their problem
• I've dumped the disc multiple times just to make sure it's legit
• disc is HFS with MacJapanese filenames

CD-ROM ISO

• available on request