Runtime Access to Generic Types on Class Method

I would like to be able to access the type arguments of a class from its class methods.

To make this concrete, here is a generic instance:

import typing
import typing_inspect

T = typing.TypeVar("T")

class Inst(typing.Generic[T]):
    @classmethod
    def hi(cls):
        return cls

I can get its generic args:

>>> typing_inspect.get_args(Inst[int])
(int,)

But, these seem to get erased inside the class methods:

>>> typing_inspect.get_args(Inst[int].hi())
()

Start with the Inst[int] and classmethod examples in the issue, then inspect the typing and typing_inspect behavior involved in resolving generic aliases at runtime. The work is done when a class method can access the type arguments of the specialized class without erasing them, with behavior demonstrated for the reported example.