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Revert "[py] avoid resizing py-source output"

This reverts commit 8e76c71be6136f4e2289f8c67e422097f5e10dfe.

No need to copy here, the culprit should be in py-sink.c.

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

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

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

       return vec;

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

       // short read, return a shorter array

-      PyArrayObject *shortread = (PyArrayObject*)

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

-            NPY_ARRAY_ENSURECOPY);

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

       PyArray_Dims newdims;

       PyObject *reshaped;

       newdims.len = PyArray_NDIM(shortread);