Hello, I try to implement a *proof of concept* of Pep-0604 <https://www.python.org/dev/peps/pep-0604/>.
To do this, the _GenericAlias must be in builtin, because I would like to update issubclass() and isinstance() to accept Union. These methods are in builtin, and must be run without others modules. But, the class _GenericAlias is in typing module, with the Python implementation in Lib/typing.py, and the C implementation is in Modules/_ctypes. For you, what is the best approach to move the _GenericAlias and all dependencies in the builtin "module" ? Philippe
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