email.contentmanager.raw_data_manager bytes handler breaks on 7bit cte

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-01-07.22:27:03.821>
labels = ['3.8', 'type-bug', 'library']
title = 'email.contentmanager.raw_data_manager bytes handler breaks on 7bit cte'
updated_at = <Date 2020-01-07.22:27:03.821>
user = 'https://bugs.python.org/rmccampbell7'

bugs.python.org fields:

activity = <Date 2020-01-07.22:27:03.821>
actor = 'rmccampbell7'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-01-07.22:27:03.821>
creator = 'rmccampbell7'
dependencies = []
files = []
hgrepos = []
issue_num = 39252
keywords = []
message_count = 1.0
messages = ['359555']
nosy_count = 1.0
nosy_names = ['rmccampbell7']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39252'
versions = ['Python 3.8']