_Pickler_CommitFrame() always returns 0 and its return code is checked needlessly

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-06-02.11:05:03.462>
labels = ['type-feature', 'library', '3.10']
title = '_Pickler_CommitFrame() always returns 0 and its return code is checked needlessly'
updated_at = <Date 2020-06-02.11:05:38.428>
user = 'https://github.com/remilapeyre'

bugs.python.org fields:

activity = <Date 2020-06-02.11:05:38.428>
actor = 'remi.lapeyre'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-06-02.11:05:03.462>
creator = 'remi.lapeyre'
dependencies = []
files = []
hgrepos = []
issue_num = 40842
keywords = []
message_count = 1.0
messages = ['370603']
nosy_count = 1.0
nosy_names = ['remi.lapeyre']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40842'
versions = ['Python 3.10']