[issue17742] Add _PyBytesWriter API

[Antoine Pitrou]

Antoine Pitrou added the comment:

The last patch increases the size of the code substantially. I'm still wondering what the benefits are.

$ hg di --stat
 Include/bytesobject.h      |   90 ++++++++++++++
 Misc/NEWS                  |    3 +
 Objects/bytesobject.c      |  144 ++++++++++++++++++++++
 Objects/stringlib/codecs.h |  109 ++++------------
 Objects/unicodeobject.c    |  267 ++++++++++++++++-------------------------
 5 files changed, 368 insertions(+), 245 deletions(-)

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<http://bugs.python.org/issue17742>
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