On windows read locked file can be written to

[adalfarus]

You need to use msvcrt like file locker to create a hard lock

[adalfarus]

Pycharm for example can still write to a read locked file even though it tells you it's locked

[wolph]

The stale bot unfortunately closes stuff too fast at times, sorry about that.

The library used to use msvcrt for locking, but that had some different issues: #64
You can see the diff here:
89e2e32

Would it be possible for you to verify that the old version (i.e. 2.4.0 or lower) works?