WeakKeyDictionary should support lookup by id instead of hash

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-05-15.08:42:51.954>
labels = ['3.7', '3.8', '3.9', '3.10', '3.11', 'type-feature', 'library']
title = 'WeakKeyDictionary should support lookup by id instead of hash'
updated_at = <Date 2021-08-26.22:27:51.360>
user = 'https://github.com/conchylicultor'

bugs.python.org fields:

activity = <Date 2021-08-26.22:27:51.360>
actor = 'youtux'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-05-15.08:42:51.954>
creator = 'conchylicultor'
dependencies = []
files = []
hgrepos = []
issue_num = 44140
keywords = []
message_count = 4.0
messages = ['393707', '396362', '396451', '396452']
nosy_count = 5.0
nosy_names = ['josh.r', 'youtux', 'brandtbucher', 'conchylicultor', 'andrei.avk']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue44140'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10', 'Python 3.11']