"u#" doesn't check object type

[atsuoishimoto]

BPO	637547
Nosy	@malemburg, @birkenfeld, @atsuoishimoto

^{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/malemburg'
closed_at = <Date 2006-06-14.06:47:47.000>
created_at = <Date 2002-11-13.04:00:30.000>
labels = ['expert-unicode']
title = '"u#" doesn\'t check object type'
updated_at = <Date 2006-06-14.06:47:47.000>
user = 'https://github.com/atsuoishimoto'

bugs.python.org fields:

activity = <Date 2006-06-14.06:47:47.000>
actor = 'georg.brandl'
assignee = 'lemburg'
closed = True
closed_date = None
closer = None
components = ['Unicode']
creation = <Date 2002-11-13.04:00:30.000>
creator = 'ishimoto'
dependencies = []
files = []
hgrepos = []
issue_num = 637547
keywords = []
message_count = 2.0
messages = ['13198', '13199']
nosy_count = 3.0
nosy_names = ['lemburg', 'georg.brandl', 'ishimoto']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue637547'
versions = []

[atsuoishimoto]

PyArg_ParseTuple(arg, "u#", p) doesn't check type
of argument. So passing string object,
PyArg_ParseTuple() doesn't report error and returns
broken Unicode string.

[birkenfeld]

Logged In: YES
user_id=849994

The "u" format code doesn't accept buffers anymore.