Email Header Folding Converts Non-CRLF Newlines to CRLFs

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-01-21.18:21:38.334>
labels = ['type-bug', 'library', '3.11']
title = 'Email Header Folding Converts Non-CRLF Newlines to CRLFs'
updated_at = <Date 2022-01-21.18:21:38.334>
user = 'https://bugs.python.org/jwalterclark'

bugs.python.org fields:

activity = <Date 2022-01-21.18:21:38.334>
actor = 'jwalterclark'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2022-01-21.18:21:38.334>
creator = 'jwalterclark'
dependencies = []
files = []
hgrepos = []
issue_num = 46462
keywords = []
message_count = 1.0
messages = ['411171']
nosy_count = 1.0
nosy_names = ['jwalterclark']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue46462'
versions = ['Python 3.11']