copying temp file fails in ion.py

Я использую:
I use:

• Windows 8.1 x64
• Python 3.8.1
• Far Manager 3.0.5596 x64 (as user or as Administrator - no matter)

Вот файл test.py, который падает с ошибкой:
Here is the file test.py that fails:

import descript.ion
with descript.ion.open('.\\test.py') as f:
    f.description = 'Description 1'
# Файл 'descript.ion' создался и содержит описание test.py
# File 'descript.ion' created; it contains the description of test.py
with descript.ion.open('.\\test.py') as f:
    f.description = 'Description 2'
# Traceback (most recent call last):
#   File "D:\V\Programs\Python\description\test.py", line 8, in <module>
#     f.description = 'Description 2'
#   File "C:\Program Files\Python\lib\site-packages\descript\ion.py", line 97, in __set__
#     self[obj.name] = val
#   File "C:\Program Files\Python\lib\site-packages\descript\ion.py", line 87, in __setitem__
#     del self[key]
#   File "C:\Program Files\Python\lib\site-packages\descript\ion.py", line 91, in __delitem__
#     delete_key(key)
#   File "C:\Program Files\Python\lib\site-packages\descript\ion.py", line 42, in wrapper
#     return clbl(dfile, key, *args, **kwargs)
#   File "C:\Program Files\Python\lib\site-packages\descript\ion.py", line 60, in delete_key
#     copyfile(dst.name, dfile)
#   File "C:\Program Files\Python\lib\shutil.py", line 259, in copyfile
#     with open(src, 'rb') as fsrc, open(dst, 'wb') as fdst:
# PermissionError: [Errno 13] Permission denied: 'C:\\TEMP\\tmp_o6x646l'

Для отладки я добавил строку в ion.py:
I added debug line into ion.py:

        input("Temporary file: "+dst.name)
        # Здесь я проверил, что временный файл существует и доступен для чтения
        # Here I checked that the temporary file exists and is readable
        copyfile(dst.name, dfile)

Возможно, проблема в этом:
This may be the reason of the problem:
https://docs.python.org/3/library/tempfile.html#tempfile.NamedTemporaryFile:

Whether the name can be used to open the file a second time, while the named temporary file is still open, varies across platforms (it can be so used on Unix; it cannot on Windows NT or later).

Возможные изменения в функции delete_key(dfile, key)
Possible changes in function delete_key(dfile, key):

    ...
    dst = tempfile.NamedTemporaryFile('w+', delete = False)
    with native_open(dfile, 'r') as src:
        ...
    dst.close()
    copyfile(dst.name, dfile)
    os.remove(dst.name)
    ...