weakref class name are hardcoded in reprs

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-04-25.03:05:17.540>
labels = ['3.8', 'type-feature', 'library']
title = 'weakref class name are hardcoded in reprs'
updated_at = <Date 2020-11-17.06:57:50.447>
user = 'https://github.com/OhBonsai'

bugs.python.org fields:

activity = <Date 2020-11-17.06:57:50.447>
actor = 'OhBonsai'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-04-25.03:05:17.540>
creator = 'OhBonsai'
dependencies = []
files = []
hgrepos = []
issue_num = 40383
keywords = ['patch']
message_count = 1.0
messages = ['367248']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'corona10']
pr_nums = ['19707']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40383'
versions = ['Python 3.8']