email: ValueError in get_section when parsing header with non-ASCII digit

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-01-17.17:14:51.665>
labels = ['type-bug', '3.8', '3.9', '3.10', '3.7', 'library']
title = 'email: ValueError in get_section when parsing header with non-ASCII digit'
updated_at = <Date 2021-01-17.17:14:51.665>
user = 'https://github.com/The-Compiler'

bugs.python.org fields:

activity = <Date 2021-01-17.17:14:51.665>
actor = 'The Compiler'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-01-17.17:14:51.665>
creator = 'The Compiler'
dependencies = []
files = []
hgrepos = []
issue_num = 42946
keywords = []
message_count = 1.0
messages = ['385162']
nosy_count = 4.0
nosy_names = ['barry', 'r.david.murray', 'maxking', 'The Compiler']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42946'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']