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[py] avoid resizing py-source output

Make sure a copy of the source output is taken before resizing it.

--- a/python/ext/py-source.c

+++ b/python/ext/py-source.c

@@ -573,7 +573,9 @@

       return vec;

     } else if (PyLong_AsLong(size) > 0) {

       // short read, return a shorter array

-      PyArrayObject *shortread = (PyArrayObject*)PyTuple_GetItem(done, 0);

+      PyArrayObject *shortread = (PyArrayObject*)

+        PyArray_FROM_OTF(PyTuple_GetItem(done, 0), NPY_NOTYPE,

+            NPY_ARRAY_ENSURECOPY);

       PyArray_Dims newdims;

       PyObject *reshaped;

       newdims.len = PyArray_NDIM(shortread);