I don't think is cross-platform, because I'm still on Windows but in different shells. More over, pathlib currently support cross-platform comparison. I can save a configuration file on Linux and open it on Windows with such paths. I use myPath.as_posix() to solve this problem.

pathlib just needs to detect the environment and then it needs to extend its understanding of equal in MinGW and Cygwin that C:\ is equal to /c/.

That's not a big deal. 

Do I realy need to register in a heavy overloaded mailing list for such a simple fix? This will take months to implement and deploy... 

Python is now on GitHub, why can't we use an issue as any other open source project does?

What is a "MinGW facility"?