Invalid flag for some code page decoders

BPO	36312
Nosy	@malemburg, @doerwalter, @pfmoore, @tjguk, @zware, @serhiy-storchaka, @zooba, @miss-islington
PRs	bpo-36312: Fix decoders for some code pages. #12369 [3.7] bpo-36312: Fix decoders for some code pages. (GH-12369) #12475

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2019-03-21.15:47:41.883>
created_at = <Date 2019-03-16.08:59:08.074>
labels = ['interpreter-core', '3.8', 'type-bug', '3.7', 'OS-windows']
title = 'Invalid flag for some code page decoders'
updated_at = <Date 2019-03-21.15:47:41.882>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2019-03-21.15:47:41.882>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2019-03-21.15:47:41.883>
closer = 'serhiy.storchaka'
components = ['Interpreter Core', 'Windows']
creation = <Date 2019-03-16.08:59:08.074>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 36312
keywords = ['patch']
message_count = 3.0
messages = ['338067', '338507', '338522']
nosy_count = 8.0
nosy_names = ['lemburg', 'doerwalter', 'paul.moore', 'tim.golden', 'zach.ware', 'serhiy.storchaka', 'steve.dower', 'miss-islington']
pr_nums = ['12369', '12475']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36312'
versions = ['Python 3.7', 'Python 3.8']