[subinterpreters] Per-interpreter singletons (None, True, False, etc.)

vstinner

BPO	39511
Nosy	@rhettinger, @vstinner, @ericsnowcurrently, @mloskot, @pablogsal, @h-vetinari, @JunyiXie, @KubaO
PRs	bpo-39511: PyThreadState_Clear() calls on_delete #18296 bpo-39511: Fix multiprocessing semlock_acquire() #18298 [WIP] bpo-39511: Add Py_GetNone() and Py_GetNoneRef() functions #18301 bpo-43503: Make limited API objects effectively immutable. #24828

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-01-31.15:33:35.261>
labels = ['expert-subinterpreters', '3.9']
title = '[subinterpreters] Per-interpreter singletons (None, True, False, etc.)'
updated_at = <Date 2022-01-28.13:50:38.344>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2022-01-28.13:50:38.344>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Subinterpreters']
creation = <Date 2020-01-31.15:33:35.261>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 39511
keywords = ['patch']
message_count = 32.0
messages = ['361121', '361122', '361137', '361138', '361145', '361146', '361161', '361163', '361164', '361256', '361257', '361258', '361355', '361356', '361357', '361380', '361382', '361543', '364384', '364429', '364446', '364469', '364471', '364485', '366342', '368937', '388409', '388417', '388894', '388921', '411512', '411996']
nosy_count = 8.0
nosy_names = ['rhettinger', 'vstinner', 'eric.snow', 'mloskot', 'pablogsal', 'h-vetinari', 'JunyiXie', 'KubaO']
pr_nums = ['18296', '18298', '18301', '24828']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue39511'
versions = ['Python 3.9']