Encode to EBCDIC doesn't take into account conversion table irregularities

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-06-07.11:41:40.052>
labels = ['type-bug', 'invalid', 'expert-unicode']
title = "Encode to EBCDIC doesn't take into account conversion table irregularities"
updated_at = <Date 2017-06-07.15:45:17.575>
user = 'https://bugs.python.org/VladimirFilippov'

bugs.python.org fields:

activity = <Date 2017-06-07.15:45:17.575>
actor = 'Vladimir Filippov'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Unicode']
creation = <Date 2017-06-07.11:41:40.052>
creator = 'Vladimir Filippov'
dependencies = []
files = []
hgrepos = []
issue_num = 30586
keywords = []
message_count = 3.0
messages = ['295329', '295336', '295352']
nosy_count = 4.0
nosy_names = ['vstinner', 'ezio.melotti', 'serhiy.storchaka', 'Vladimir Filippov']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue30586'
versions = ['Python 3.6']