inspect.getdoc could examine the __class__ cell for dynamically generated subclasses

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-10-27.15:24:34.311>
labels = ['library', '3.9']
title = 'inspect.getdoc could examine the __class__ cell for dynamically generated subclasses'
updated_at = <Date 2019-11-24.20:44:00.320>
user = 'https://github.com/anntzer'

bugs.python.org fields:

activity = <Date 2019-11-24.20:44:00.320>
actor = 'BTaskaya'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-10-27.15:24:34.311>
creator = 'Antony.Lee'
dependencies = []
files = []
hgrepos = []
issue_num = 38603
keywords = ['patch']
message_count = 1.0
messages = ['355472']
nosy_count = 2.0
nosy_names = ['yselivanov', 'Antony.Lee']
pr_nums = ['16957']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue38603'
versions = ['Python 3.9']