Expose a way to determine if a process has been closed or not

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-01-11.19:55:45.985>
labels = ['type-feature', '3.10']
title = 'Expose a way to determine if a process has been closed or not'
updated_at = <Date 2021-01-11.19:55:45.985>
user = 'https://github.com/petervansickel'

bugs.python.org fields:

activity = <Date 2021-01-11.19:55:45.985>
actor = 'petervansickel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2021-01-11.19:55:45.985>
creator = 'petervansickel'
dependencies = []
files = []
hgrepos = []
issue_num = 42897
keywords = []
message_count = 1.0
messages = ['384860']
nosy_count = 1.0
nosy_names = ['petervansickel']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42897'
versions = ['Python 3.10']