Make methods of `PyObject` inherited from its base .NET classes GIL-safe by lostmsu · Pull Request #1711 · pythonnet/pythonnet

What does this implement/fix? Explain your changes.

passing Python objects to unsuspecting .NET methods, that accept object would lead to crash if those methods try to use standard .NET System.Object members without acquiring the Python GIL first.

Does this close any currently open issues?

fixes #1642

Checklist

Check all those that are applicable and complete.