New issue 2751: cpyext: PyObject_AsWriteBuffer() does not work with
array.array()
https://bitbucket.org/pypy/pypy/issues/2751/cpyext-pyobject_aswritebuffer-does-not
Christoph Reiter:
In Python:
```
#!python
data = array.array('B', [0])
```
passing this to the following C code:
```
#!C
...
unsigned char *buffer;
Py_ssize_t buffer_len;
PyObject *obj;
if (!PyArg_ParseTuple (args, "O", &obj))
return NULL;
res = PyObject_AsWriteBuffer (obj, (void **)&buffer, &buffer_len);
if (res == -1)
return NULL;
...
```
fails with "TypeError: expected a writeable buffer object" while it succeeds
with CPython.
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