How to correctly type descriptors in Python.

This approach is 100% supported by the pyright type checker.

Have a look at the Python files in this repo:

• descriptor.py contains the definition of all descriptor protocols
• property.py contains a redefinition of Python's builtin property type, but it's correctly typed.
• usage.py contains some examples

[!WARNING] Everything here needs Python 3.13 installed (e.g. pyenv install 3.13-dev) to work correctly. If you need it in an older Python version, simply use the old TypeVar syntax.