MappingProxy objects should JSON serialize just like a dictionary

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This issue has not been assessed yet.

Description

assignee = 'https://github.com/etrepum'
closed_at = None
created_at = <Date 2018-10-01.01:56:32.505>
labels = ['3.8', 'type-bug', 'library']
title = 'MappingProxy objects should JSON serialize just like a dictionary'
updated_at = <Date 2020-10-19.22:24:41.612>
user = 'https://bugs.python.org/MichaelSmith2'

activity = <Date 2020-10-19.22:24:41.612>
actor = 'eric.araujo'
assignee = 'bob.ippolito'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-10-01.01:56:32.505>
creator = 'Michael Smith2'
dependencies = []
files = []
hgrepos = []
issue_num = 34858
keywords = []
message_count = 10.0
messages = ['326756', '326761', '326845', '326849', '343617', '370826', '370828', '370830', '370844', '379041']
nosy_count = 7.0
nosy_names = ['rhettinger', 'bob.ippolito', 'eric.araujo', 'serhiy.storchaka', 'Nathaniel Manista', 'Michael Smith2', 'zgoda.mobica']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34858'
versions = ['Python 3.8']

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