idna/punycode give wrong results on narrow builds

[bukzor]

BPO	22455
Nosy	@malemburg, @ncoghlan, @vstinner, @bukzor, @jleedev

^{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 2020-12-01.10:53:20.365>
created_at = <Date 2014-09-21.22:09:35.324>
labels = []
title = 'idna/punycode give wrong results on narrow builds'
updated_at = <Date 2020-12-01.10:53:20.365>
user = 'https://github.com/bukzor'

bugs.python.org fields:

activity = <Date 2020-12-01.10:53:20.365>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2020-12-01.10:53:20.365>
closer = 'iritkatriel'
components = []
creation = <Date 2014-09-21.22:09:35.324>
creator = 'bukzor'
dependencies = []
files = []
hgrepos = []
issue_num = 22455
keywords = []
message_count = 2.0
messages = ['227240', '237470']
nosy_count = 5.0
nosy_names = ['lemburg', 'ncoghlan', 'vstinner', 'bukzor', 'jleedev']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue22455'
versions = ['Python 2.7']

[bukzor]

I have "fixed" the issue in my branch here:
bukzor/cpython@013e689

I don't propose it as a patch, but as a proof of concept and point of discussion.

If there's no chance of shipping a fix in 2.7.9, feel free to close.

[BreamoreBoy]

As 2.7 is to be supported until 2020 and a potential fix is available shouldn't we be using it?