the legacy Py_UNICODE API.

Add also a new _PyUnicodeWriter_WriteChar() function.

display invalid strings. Such strings can be found while Python is creating a
new string, in a text decoder for example, when Python is compiled in debug
mode.

Fix a crash when setting a servername callback on a SSL server socket and the client doesn't send a server name.
Patch by Kazuhiro Yoshida.
(originally issue #8109)

#5609 - test_urllib coverage for url2pathname and pathname2url. Patch
contribution by Thomas Fenzl & Maksim Kozyarchuk

contribution by Thomas Fenzl & Maksim Kozyarchuk

Patch by Claudiu Popa.

strings are not convincing. For UCS2 (16-bit wchar_t type), use a dummy loop
instead of wmemcmp(). The dummy loop is as fast, or a little bit faster.

wchar_t is only 16-bit long on Windows. wmemcmp() is still used for 32-bit
wchar_t.

the default exception/value when called instead of raising/returning
NotimplementedError/NotImplemented (except where appropriate).
This should allow for the ABCs to act as the bottom/end of the MRO with expected
default results.

As part of this work, also make importlib.abc.Loader.module_repr()
optional instead of an abstractmethod.

PyUnicode_WRITE() expands some parameters twice or more.

it twice

Inline the BLOOM_MEMBER() to only call PyUnicode_READ() only once (per loop
iteration). Store also the length of the seperator in a variable to avoid calls
to PyUnicode_GET_LENGTH().

Avoid expensive PyUnicode_READ() and PyUnicode_WRITE(), manipulate pointers
instead.

Write specialized functions per Unicode kind to avoid the expensive
PyUnicode_READ() macro.

"PyUnicode_READ_CHAR() is less efficient than PyUnicode_READ() because it calls
PyUnicode_KIND() and might call it twice." according to its documentation.

cp037, cp500 and iso8859_1 codecs

>>> import asyncore
>>> d = asyncore.dispatcher()
>>> d.close()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.4/asyncore.py", line 401, in close
    self.socket.close()
AttributeError: 'NoneType' object has no attribute 'close'
>>>