test_Class_params fails in the released 0.10.0 version

[catern]

Expected Behavior

All tests pass - they were run as part of this package update: NixOS/nixpkgs#135261

Actual Behavior

test_Class_params fails with

======================================================================
FAIL: test_Class_params (pdoc.test.ApiTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/build/pdoc3-0.10.0/pdoc/test/__init__.py", line 100, in wrapper
    func(*args, **kwargs)
  File "/build/pdoc3-0.10.0/pdoc/test/__init__.py", line 1055, in test_Class_params
    self.assertEqual(pdoc.Class('G2', mod, G2).params(), ['*args', '**kwds'])
AssertionError: Lists differ: [] != ['*args', '**kwds']

Second list contains 2 additional elements.
First extra element 0:
'*args'

- []
+ ['*args', '**kwds']

Steps to Reproduce

Run the tests on version 0.10.0 on PyPI. We're doing through python setup.py test.

Additional info

• pdoc version: 0.10.0

[catern]

This test failure was introduced in commit d68abcc and is present in CPython 3.9 and not present in CPython 3.8.

[catern]

Which was introduced by PR #242 - @RaduG do you know what might be the right fix for this test failure?

[RaduG]

Hi @catern, this issue is caused by Python's typing.Generic class:

• in (and up to) 3.8, typing.Generic defines a __new__ magic method
• in 3.9 the method was removed

The fix would be to stop using typing.Generic as a base and just create a base class that implements __new__. This does not affect the functionality in the PR, it's just a test detail. Happy to address this.