[issue1943] improved allocation of PyUnicode objects

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at egenix.com> added the comment:

modules to py3k.
> This is not an implementation detail.

It is, otherwise I would have documented it. The fact that some
developers are not using those APIs correctly doesn't change that.

Note that PyUnicode_AsUnicode() only returns a pointer to the
Py_UNICODE buffer. It makes no guarantees on the 0-termination.
Developers need to use PyUnicode_GetSize() to access the size
of the Unicode string.

But no worries: We're not going to change it. It's too late
after 10 years in the wild.

Still, developers will have to be aware of the fact that 0-termination
is not a guaranteed Unicode feature and should stop making that
assumption and it will not necessarily hold or be guaranteed
for Unicode subclasses.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1943>
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