File gets truncated upon unpickling

[JanPokorny]

It seems that whenever a file is open for writing in the session, the (already closed) file object f gets unpickled in such a way that re-opens the file in writing mode, effectively truncating the file to zero length.

Is this expected behavior?

❯ python -c "
  with open('file.txt', 'w') as f:
    f.write('hello world')
  import dill
  dill.dump_module('session.pkl')
  "

❯ cat file.txt
hello world⏎                                                                                                                                                                                                                                                                                                                                                                                                   

❯ python -c "
  import dill
  dill.load_module('session.pkl')
  "

❯ cat file.txt

❯