codecs.lookup() ignores non-ASCII characters, whereas encodings.normalize_encoding() copies them

vstinner

BPO	39337
Nosy	@malemburg, @vstinner, @serhiy-storchaka, @shihai1991
PRs	[WIP] bpo-39337: calling encodings.normalize_encoding() in codecs.normalizestring() to keep same behavior #18845 [WIP]bpo-39337: Adding a _Py_normalize_unicode_encoding() in unicodeobject.c #18987 bpo-39337: Add a test case for normalizing of codec names #19069 bpo-39337: encodings.normalize_encoding() now ignores non-ASCII characters #22219 bpo-41842: Add a unregister function in _codecs module #22360 bpo-37751: Document the change in What's New in Python 3.9 #17997

^{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 = None
closed_at = <Date 2020-10-14.15:46:55.467>
created_at = <Date 2020-01-14.21:54:42.124>
labels = ['library', '3.10']
title = 'codecs.lookup() ignores non-ASCII characters, whereas encodings.normalize_encoding() copies them'
updated_at = <Date 2020-10-14.15:55:50.301>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-10-14.15:55:50.301>
actor = 'shihai1991'
assignee = 'none'
closed = True
closed_date = <Date 2020-10-14.15:46:55.467>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2020-01-14.21:54:42.124>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 39337
keywords = ['patch']
message_count = 11.0
messages = ['360004', '363645', '364180', '364449', '364452', '364456', '377772', '378281', '378626', '378628', '378630']
nosy_count = 4.0
nosy_names = ['lemburg', 'vstinner', 'serhiy.storchaka', 'shihai1991']
pr_nums = ['18845', '18987', '19069', '22219', '22360', '17997']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39337'
versions = ['Python 3.10']