zipfile extractall needlessly re-wraps ZipInfo instances

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-02-01.15:10:53.067>
labels = ['3.8', 'type-feature', 'library']
title = 'zipfile extractall needlessly re-wraps ZipInfo instances'
updated_at = <Date 2018-03-27.16:53:40.745>
user = 'https://github.com/peterbe'

bugs.python.org fields:

activity = <Date 2018-03-27.16:53:40.745>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-02-01.15:10:53.067>
creator = 'peterbe'
dependencies = []
files = []
hgrepos = []
issue_num = 32742
keywords = ['patch']
message_count = 3.0
messages = ['311434', '311435', '314539']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'peterbe']
pr_nums = ['5472']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue32742'
versions = ['Python 3.8']