The idea in my last post was quite bad,
setting name to None breaks a lot of functions
that expect name to be a string.

Path('.').parent and Path('..').parent both return '.'.

Even if it is not stupid (regarding them as special dirs
pointing to somewhere else but still being inside the directory).

I don't know why anyone would rely on such a behaviour...

The tests expect Path('..').stem() to be '..'
and expect Path('.').stem() to be ''

Once again, I don't know why anyone should rely on it but
I fear I can't do a lot without breaking this one part of the test.

I'm working on it and posting something by the end of the Week.