bug fix to prevent io.BytesIO from accepting arbitrary keyword arguments

[erickt]

BPO	5449
Nosy	@pitrou, @avassalotti, @benjaminp
Files	0001-Fix-io.BytesIO-to-not-accept-arbitrary-keywords.patch

^{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 2009-08-04.23:21:23.779>
created_at = <Date 2009-03-08.23:52:58.566>
labels = ['type-bug', 'library']
title = 'bug fix to prevent io.BytesIO from accepting arbitrary keyword arguments'
updated_at = <Date 2009-08-04.23:21:23.777>
user = 'https://bugs.python.org/erickt'

bugs.python.org fields:

activity = <Date 2009-08-04.23:21:23.777>
actor = 'alexandre.vassalotti'
assignee = 'none'
closed = True
closed_date = <Date 2009-08-04.23:21:23.779>
closer = 'alexandre.vassalotti'
components = ['Library (Lib)']
creation = <Date 2009-03-08.23:52:58.566>
creator = 'erickt'
dependencies = []
files = ['13271']
hgrepos = []
issue_num = 5449
keywords = ['patch']
message_count = 2.0
messages = ['83337', '91283']
nosy_count = 4.0
nosy_names = ['pitrou', 'alexandre.vassalotti', 'benjamin.peterson', 'erickt']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue5449'
versions = ['Python 3.0', 'Python 3.1']

[erickt]

I noticed that it was possible to specify arbitrary arguments to
io.BytesIO:

>>> io.BytesIO(b'foo', foo=1)
<_io.BytesIO object at 0x430150>

But io.StringIO doesn't:

>>> io.StringIO('foo', foo=1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'foo' is an invalid keyword argument for this function

So, I've attached a little patch that uses the same technique 3.1a1 uses
to parse the arguments. One thing to be aware of is that I named the
kwarg "intial_bytes" just like http://docs.python.org/3.0/library/io.html#io.BytesIO instead of
"inital_value" like io.StringIO. I'm not sure if it'd be desirable to be
consistent between the two.

[avassalotti]

Committed in r74316.

Thanks!