bytes decode raises OverflowError desipte errors='ignore'

[Naitbit]

BPO	31825
Nosy	@vstinner, @ericvsmith, @ezio-melotti, @serhiy-storchaka, @Naitbit
PRs	bpo-31825: Fixed OverflowError in the 'unicode-escape' codec #4058 [3.6] bpo-31825: Fixed OverflowError in the 'unicode-escape' codec (GH-4058) #4059

^{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 2017-10-20.14:42:35.636>
created_at = <Date 2017-10-20.09:58:20.153>
labels = ['interpreter-core', 'type-bug', '3.7', 'expert-unicode']
title = "bytes decode raises OverflowError desipte errors='ignore'"
updated_at = <Date 2017-10-20.14:42:35.635>
user = 'https://github.com/Naitbit'

bugs.python.org fields:

activity = <Date 2017-10-20.14:42:35.635>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2017-10-20.14:42:35.636>
closer = 'serhiy.storchaka'
components = ['Interpreter Core', 'Unicode']
creation = <Date 2017-10-20.09:58:20.153>
creator = 'Naitbit'
dependencies = []
files = []
hgrepos = []
issue_num = 31825
keywords = ['patch']
message_count = 4.0
messages = ['304651', '304656', '304658', '304659']
nosy_count = 5.0
nosy_names = ['vstinner', 'eric.smith', 'ezio.melotti', 'serhiy.storchaka', 'Naitbit']
pr_nums = ['4058', '4059']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31825'
versions = ['Python 3.6', 'Python 3.7']

[Naitbit]

In Python 3.5 and earlier (tested 3.5.3 and 2.7.13)
b'\\\xfa'.decode('unicode-escape', errors='ignore')
did return '\\ú'

but in Python 3.6 it raises
OverflowError: decoding with 'unicode-escape' codec failed (OverflowError: character argument not in range(0x110000))

Python 3.6.1 (default, Sep 7 2017, 16:36:03)
[GCC 6.3.0 20170406] on linux

[serhiy-storchaka]

New changeset 56cb465 by Serhiy Storchaka in branch 'master':
bpo-31825: Fixed OverflowError in the 'unicode-escape' codec (bpo-4058)
56cb465

[serhiy-storchaka]

New changeset 1e78ed6 by Serhiy Storchaka (Miss Islington (bot)) in branch '3.6':
bpo-31825: Fixed OverflowError in the 'unicode-escape' codec (GH-4058) (bpo-4059)
1e78ed6

[serhiy-storchaka]

Thank you for your report Sebastian.