There is a way to access an underlying mapping in MappingProxyType #88004

assignee = None
closed_at = <Date 2021-08-07.07:55:34.904>
created_at = <Date 2021-04-14.07:34:28.852>
labels = ['interpreter-core', 'type-bug', '3.8', '3.9', '3.10']
title = 'There is a way to access an underlying mapping in MappingProxyType'
updated_at = <Date 2021-08-07.08:52:38.535>
user = 'https://github.com/serhiy-storchaka'

activity = <Date 2021-08-07.08:52:38.535>
actor = 'ncoghlan'
assignee = 'none'
closed = True
closed_date = <Date 2021-08-07.07:55:34.904>
closer = 'gvanrossum'
components = ['Interpreter Core']
creation = <Date 2021-04-14.07:34:28.852>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 43838
keywords = ['patch']
message_count = 13.0
messages = ['391039', '397244', '397245', '398023', '398025', '398033', '398045', '398072', '398700', '399022', '399057', '399059', '399171']
nosy_count = 6.0
nosy_names = ['gvanrossum', 'rhettinger', 'ncoghlan', 'serhiy.storchaka', 'brandtbucher', 'domdfcoding']
pr_nums = ['27300']
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43838'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']