Provide a way to skip magic-number search in ZipFile(mode='a')

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-12-07.22:40:05.720>
labels = ['type-feature', 'library', '3.10']
title = "Provide a way to skip magic-number search in ZipFile(mode='a')"
updated_at = <Date 2020-12-07.22:40:05.720>
user = 'https://bugs.python.org/BartRobinson'

bugs.python.org fields:

activity = <Date 2020-12-07.22:40:05.720>
actor = 'Bart Robinson'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-12-07.22:40:05.720>
creator = 'Bart Robinson'
dependencies = []
files = []
hgrepos = []
issue_num = 42594
keywords = []
message_count = 1.0
messages = ['382691']
nosy_count = 1.0
nosy_names = ['Bart Robinson']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42594'
versions = ['Python 3.10']