--replaces-process throws exception in multiprocessing

[GregPK]

Script runs fine in all other cases, but running with --replaces-process on my machine like so:

notify-send.py --replaces-process testrep "Test replaces"

causes:

Traceback (most recent call last):
  File "/home/gregpk/.local/pipx/venvs/notify-send-py/lib/python3.11/site-packages/notify_send_py/notify_send_py.py", line 126, in notify
    conn = Client(pidf.read())
           ^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/multiprocessing/connection.py", line 513, in Client
    family = family or address_type(address)
                       ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/multiprocessing/connection.py", line 109, in address_type
    raise ValueError('address type of %r unrecognized' % address)
ValueError: address type of b'' unrecognized

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/gregpk/.local/bin/notify-send.py", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/gregpk/.local/pipx/venvs/notify-send-py/lib/python3.11/site-packages/notify_send_py/notify_send_py.py", line 218, in main
    NotifySendPyCLI()
  File "/home/gregpk/.local/pipx/venvs/notify-send-py/lib/python3.11/site-packages/notify_send_py/notify_send_py.py", line 199, in __init__
    n_id = NotifySendPy().notify(
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/gregpk/.local/pipx/venvs/notify-send-py/lib/python3.11/site-packages/notify_send_py/notify_send_py.py", line 132, in notify
    pidf.write(listener.address)
TypeError: a bytes-like object is required, not 'str'