pprint does not work for typing.Mapping

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-07-07.13:28:25.933>
labels = ['3.8', 'type-bug', 'library']
title = 'pprint does not work for typing.Mapping'
updated_at = <Date 2021-07-07.13:33:00.739>
user = 'https://bugs.python.org/hclark'

bugs.python.org fields:

activity = <Date 2021-07-07.13:33:00.739>
actor = 'hclark'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-07-07.13:28:25.933>
creator = 'hclark'
dependencies = []
files = []
hgrepos = []
issue_num = 44580
keywords = []
message_count = 1.0
messages = ['397084']
nosy_count = 1.0
nosy_names = ['hclark']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue44580'
versions = ['Python 3.8']