ssl.SSLSocket.unwrap() is not flexible enough

GitHub fields:

assignee = 'https://github.com/tiran'
closed_at = None
created_at = <Date 2017-02-01.19:05:31.797>
labels = ['expert-SSL', 'type-bug', '3.8']
title = 'ssl.SSLSocket.unwrap() is not flexible enough'
updated_at = <Date 2018-02-25.20:29:17.370>
user = 'https://bugs.python.org/GregStark'

bugs.python.org fields:

activity = <Date 2018-02-25.20:29:17.370>
actor = 'christian.heimes'
assignee = 'christian.heimes'
closed = False
closed_date = None
closer = None
components = ['SSL']
creation = <Date 2017-02-01.19:05:31.797>
creator = 'Greg Stark'
dependencies = []
files = []
hgrepos = []
issue_num = 29413
keywords = []
message_count = 2.0
messages = ['286674', '301505']
nosy_count = 5.0
nosy_names = ['janssen', 'christian.heimes', 'alex', 'dstufft', 'Greg Stark']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue29413'
versions = ['Python 3.8']